Armless Legless Onesie 

A one-pieced garment that is also known as a bodysuit or leotard; A term usually used for referring to an infant's bodysuit or leotard.

The baby wearing the grey armless legless onesie was crawling around in his playpen.

Armless Legless Onesie by Myka M. November 26, 2018

onesie

to masturbate, have sex with oneself, to commit onanism

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

onesie by BabyA December 12, 2005

Under-Onesie 

The formation that occurs when a guy tucks his undershirt into his underwear.

Nat, when you bend over, I can see your Under-Onesie. I guess your torso never gets cold.

Under-Onesie by Ballsackreligious October 27, 2016

Onesie

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: :(

Onesie by Kempernol January 14, 2008

Onesie

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.

Onesie by Moist eyecrust November 15, 2017

onesie

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.

onesie by Onesies April 17, 2009

onesie tear 

a single tear streaming down your face

"WAHAHAHhhaaahhhh!" *onesie tear streams down face*

onesie tear by KINGLOOLOO July 27, 2009