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Colloquially it is a synonym, but technically the "Sin of Onan" for which it is named for is actually an instance of coitus interruptus.
"Onanism -- it's a hands-on job"

-Ghost, ENTER THE MATRIX
Onanism by Jay Jay Ron March 20, 2008
to wank,
to tame the one eyed monster,
to make the cyclops cry,
man's favourite outlet,
a date with mrs palm and her five
lovely daugters,
toss yourself off,
etc etc
"now on the subject of onanism...we dont want to find you hunched double on the sofa bed pumping your fist" (league of gentlemen)
onanism by pinkpill December 1, 2004
from New Latin onanismus, from Onan, son of Judah (Gen 38:9),
masturbation, coitus interruptus, self-gratification.
Jon can'g get any, so he practices onanism.
Onanism by El Cid June 21, 2003

Arboreal Onanism 

Prior to killing Martha Moxley, Michael Skakel masturbated in a nearby tree. He was convicted of 1 count of arboreal onanism.
Arboreal Onanism by TwatCop September 23, 2005
I think someone did onanism in my coffee again. That sure aint milk.

Well you would know scab mouth!
Onanism by Anonymous September 17, 2003
1.One who gives a speech with no meaning.
2.The ability to generate heat with no light.
Left wing voter: Wow! That was some speech; I almost wet my pants half way through it.
Right wing voter: What speech? That was the worst case of Obamism I've heard this year. All I heard was 40 minutes of buzzing in my ears.
Left wing voter: F*** you!
Right wing voter: F*** you back!
Obamism by H3adcas3 May 26, 2008
More from Urban Dictionary
A dead drop is a location used to secretly pass items between two people, without requiring them to meet.

Spies have been known to use dead drops, using various techniques to hide the items and to signal that the drop has been made. Drug dealers use this as well.

A common place is to duct tape the item to the underside of a toilet cover in a public restroom.

A signal is sometimes used as well to indicate there is something to pickup, like a pile of stones in a certain formation. After checking the drop the signal is removed.
"The dead drop is the restroom toilet at the Gulf station at the corner of Commercial Ave. and Georges Rd."
dead drop by rubberroom July 23, 2008
Word of the Day on November 9, 2026

No Surprises Wedding

A "No Surprises Wedding," or NSW, is a wedding invitation designation that tells attendees that there can be no unplanned announcements, engagements, events or speeches at the wedding - all actions must be pre-approved by the couple. Anyone who performs an unapproved "surprise" will be asked to leave the wedding early.

This designation comes from Reddit, where so many stories of bad wedding behavior indicated a need to communicate expectations for the wedding behavior of attendees.
You are cordially invited to the nuptials of Brian and Tom on October 31 at noon.

Please note that this wedding is child-free (under 10) and a No Surprises Wedding (NSW). Reach out to wedding planner Sami Smith to request approvals or exceptions; please note that exceptions will be rare. Limited child care for under-10s will be available. All approvals will be noted and included in planning. Unapproved, or surprise exceptions, will result in guests being asked to leave.
Word of the Day on November 8, 2026
Ulzzang true definition is "best & "face" = best face in korean. They are basically people with above average looks, sometimes with the use of photoshop and haduri who post their pics online, some becoming internet celebrities.
"Hey, see that chick over there? She's pretty enough to be an ulzzang. :D"
ulzzang by `r i k kit t y February 26, 2008
Word of the Day on November 7, 2026
EBK stands for "Elite Ball Knowledge." 1 In internet slang, "ball knowledge" originally referred to a deep understanding of football/soccer or basketball, but it has evolved into a broader term for having a highly sophisticated, deep, or niche understanding of any specific topic (such as music, movies, or subcultures).
Person A: "That scene was a direct homage to an unreleased 1982 Japanese indie film."
Person B: "Wow, EBK."
EBK by silwhett November 5, 2026
Word of the Day on November 6, 2026
A seemingly endless debate with a idiot
I don't know man im not ready for yap trap stupidity today which always tries to suck you into it
Yap Trap by WolfieSnack November 4, 2026
Word of the Day on November 5, 2026
Texas is categorized as a swing state in presidential elections, but has voted for Republicans more times than for Democrats in recent history. As such, as demographics change political alignments, some Democrats believe that Texas will vote blue, or Democratic, due to their Hispanic and African American voters, who often align themselves with the Democratic Party's liberal wing.

Blexas has been cited as possible in the upcoming decades, but only if Democrats continue to win the Hispanic vote in bigger margins.
Democrat 1: What is your prediction for the 2024 presidential election?
Democrat 2: Well uh, Blexas!
Democrat 1: You've been saying that since 2008 though.
Blexas by Tritonist June 14, 2021
Word of the Day on November 4, 2026
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