Regardless of actually being funny or not, a phrase said by someone who finds themselves hilarious, regardless of what anyone else may think.
I love telling Dad jokes, I crack myself up!
by GlazeHer November 4, 2016
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To Say Your Great. Fiends Can't Get Enough Of You.

If Your Dope, I Am CRACK
by XqUiSiT3 October 23, 2007
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To rack the balls before the start of a pool game.
Before the start of a game of pool, Biff Lambert always says , "you rack em, i crack em."
by Donald Cowboy Cerrone February 7, 2018
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A phrase used in internet forums to confess having masturbated to a posted pic or story. Frequently used to express appreciation for a pic or story even if actual masturbation hasn't taken place. Occasionally used ironically or to be comedically inappropriate.
Example 1: <user posts pic of a PAWG> ... I just cracked me one off.

Example 2: <I just found out that my mother has terminal brain cancer> ... I just cracked me one off .
by Carlton G. Long January 12, 2020
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the phrase "i was on crack" is a quick yet poor excuse for doing something stupid or retarded.
the phrase can also be used humorously with friends to play off something minor that will not bring the fbi into the picture.
fbi: will we find any sexually explicit images of children on your pc edp445?

edp: nah offica, i ain't sick like dat.
fbi: *opens up lolicon folder* "sir why is there lolicon on your pc?
edp: *shits out cupcake* "uhhh i was on crack when i downloaded that"

friend: john why did throw your hamburger at an elderly woman?
john: oh yeah, i was on crack
friend: oh ok.
by penis of johnson. November 30, 2022
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