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Colloquial description of a one piece leather suite used for motorcycle riding. Term originally coined by highly esteemed female Australian bike rider of Melbourne location many many years ago. Since purchasing her own "onesies" it has been decreeded under Melbourne Bike Rider assesment to be the hottest arse in a set of onesies evvaaaaaaaaaaar !!!
she " Dude onesies for the track today ?"

dude "hell yeah help me pull 'em on"

she " meh, your arse aint never gunna look as good as mine does in onesies"
onesies by sharkuss February 2, 2010
The most comfortable thing one can wear, there is no denying it.
Sally experienced a cozy wonderland as she put on her fuzzy onesie.
onesie by Cosmello January 11, 2015
Onesie comes from the word "one" and means a one-piece suit, usually in the form you use for lazy days at home. It is also used for one-piece snowsuits and one-piece motorcycle suits. The word is sometimes spelled onesy.

The name may be derived from the registered trademark Onesies®, which is a range of clothes for infant children. The word onesie (in singular) does however, in modern usage, more often mean a suit in adult size.
When I come home from work, I just like to change into my onesie and watch TV.
Onesie by EliasG June 4, 2013
sexyyy !
sexiest garment on earth ;)
ninette: yo bry, r u going to the pajama party ?
bry: yea im wearing my onesies
ninnete: sexayyy ! ;)
onesies by cytb April 12, 2011

wooden onesie 

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"
One piece long underwear, generally worn by infants and toddlers. Plural of onesie.
I have a drawer full of onesies from when I was five years old.
onesies by phreek123 December 9, 2008