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1.
the back end of your body i.e. booty, ass, rump, butt, etc.. etc.. etc..
Ooohh that girls got a nice backside.
by unknown January 20, 2003
 
2.
skatebaord terminology - to turn, more specifically, in the direction where after 90 degrees of spinning you are facing backwards, hence, backside.

also refers to the direction you are facing when approaching an obstacle. for example, if you roll up to a curb and it's behind you, any grind that you do on the curb without 180ing into it will be backside (including noseslides and boardslides...)
bs 180 ollies are fun, espesially if you do a sort of 45 to late 135.. its cool.
by karl July 10, 2004
 
3.
From behind, afterwards, happens after the fact.
Hey, I banged that chick and got a blow job on the backside.
by C.J. Thomas November 03, 2007
 
4.
dairy-air, as in:
i'll put a whuppun 2 ur backside, yah crackuh!
by DCPimp August 24, 2003
 
5.
Hit it doggy Style
by Quazimoto June 05, 2003
 
6.
someone with a flat ass. there ass lines up with there back.
damn dat girl got no ass
by dre February 16, 2004