18in 

Reppin, Representing, etc.

R is the 18th Letter in the Alphabet, R = Reppin

Person: Yo where you reppin?
Dude: Yo, I'm 18in New york muh nugga
Person: Word?

18in by RogRogTheTrog May 21, 2009

18 in dog years 

She was.

Perv: she was 18 in dog years!
Police:

18 in dog years by ABoiWithANovelle(: February 11, 2021

18 in 18 

The practice of ingesting a beer per hole on a regulation golf course. 18 beers in 18 holes. It usually results in uncoordinated golf and dismissal from the Golf Course. The destroying of Golf carts, clubs and apparel is also a typical result.

I pulled off 18 in 18 last week and I'm still hung over.

18 in 18 by Fitty4ex May 22, 2008