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Backside is the word used to describe when a guy has permission to enter in the alternative option. In general, all guys like to go up the backside but it's a true honor and gift.
Me: I've been dating Joe for six months, and I finally gave him a season pass to go up the backside.
Friend: Shit really? You must love this guy. Oww
by Fun&Nice August 08, 2016
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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
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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
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dairy-air, as in:
i'll put a whuppun 2 ur backside, yah crackuh!
by DCPimp August 24, 2003
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someone with a flat ass. there ass lines up with there back.
damn dat girl got no ass
by dre February 16, 2004
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