Country Dictionary

to masturbate, have sex with oneself, to commit onanism

...and I caught that bitch having a onesie in the middle of the tennis court.

A self rolled spliff that is the size of a rollie cigarette, using one regular sized rolling paper/skin.

Dave: Is there any weed left?
John: Nah man, not even enough for a onesie.
Dave: :(

When you have to pee but not poop

Hey man can I use you’re bathroom I have to do a onesie I’ll be quick.

A trademark registered to Gerber Childrenswear LLC, often used in connection with a one-piece garment for an infant or small child, generally worn over a diaper.

The child wore a Gerber Onesies garment.

a term originated from Ireland used to define a coffin

"me mum's prettier than you and she's sleepin in a bleedin wooden onesie"

A wooden onesie is a coffin.

“You fucked my sister?! I’ll put you in a god damn Wooden onesie you foreskin chomping thundercunt!!”

The act of someone in the military taking a piss. In the Military they tend to add the word combat in front of everything.

Man, I just had three sodas. Now I really have to take a combat onesie