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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"
by sharkuss February 2, 2010
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sexyyy !
sexiest garment on earth ;)
ninette: yo bry, r u going to the pajama party ?
bry: yea im wearing my onesies
ninnete: sexayyy ! ;)
by cytb March 27, 2011
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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.
by phreek123 October 20, 2008
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N. urination. Derived from the term number one. Originally used in the sitcom show Scrubs.
"Sorry, gotta go make onesies."
by Scrubby May 6, 2008
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The most comfortable thing one can wear, there is no denying it.
Sally experienced a cozy wonderland as she put on her fuzzy onesie.
by Cosmello January 12, 2015
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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.
by EliasG June 4, 2013
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A one piece snow suit. Worn back in the day when skiing was young. Now commonly worn by thy Gaper. Comes in Solid or Multiple bright colors. Do NOT wear in Colorado or you shall get mugged.
For Gaper day, I decided to wear a Onesy.
by A Local Coloradian May 3, 2009
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