know one's onions 

to be competent and authoritative in one's work

He really knows his onions when it comes distilling alcohol.(example of know one's onions)

know one's onions by The Return of Light Joker October 18, 2010

Get one up on you 

Generally said by a female- In reference to getting a guys dick up, before pleasuring it

I will get one up on you ;)

Get one up on you by Jamie12356 October 26, 2010

Capital One

Another name for the exclamation point. "!" is the majuscule or upper case form of the character "1."

Every time I write numbers in my lab reports I use capital one instead of just one. I tried to type one thousand fourhundred three and came up with "!403."

Capital One by Shank89 November 20, 2010

Blumpkie-9 plus one 

A Blumpkin is when a guy is a taking a dump and getting a blowjob at the same time.

Same idea as a blumpkin but your partner is upside down with a thumb in her butt.

John was in the bathroom getting a Blumpkie-9 plus one.

Blumpkie-9 plus one by representa2480 May 25, 2011

A site where it's a challenge to find one subject where no one talks about sex. 

Urban Dictionary

LOOK UP URBAN DICTIONARY

"A site where it's a challenge to find one subject where no one talks about sex."

A site where it's a challenge to find one subject where no one talks about sex. by URB4N D1C710N4RY April 9, 2021

And One 

After taking a hit from a bong you drink the bong water.

Hey Dude!! Did you see that he just did an And One, he almost died!

And One by OBEY_LRG_KREW July 22, 2011

Old One 

A beer that has been sitting open for hours, warm, old, and stale.

"Oh gross, I think I just drank an old one".

Old One by the_me November 4, 2012