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1.
Abbreviation for "stick it in her butt."

Could be used for "his butt" too.

"I went on a hot date last night."

"Did you siihb?"

This actually originated from Be-mag message board by a bunch of kick ass aggressive rollerbladers who own you and your mother. I will credit the user BMV aka Hatecrew Deathroll who is said to say the first instance of siihb on the internet and in history.

www.be-mag.com
"I went on a hot date last night."

"Did you siihb?"

Stick it in her butt.
av Fetusaurus Rex 24 mars 2007
 
2.
Abbreviation for "stick it in her butt."

Could be used for "his butt" too.

Seemed to have originated from PhantasyTour.com message boards by dirty hippies.
"I went on a hot date last night."

"Did you ssihb?"
av PTer 21 april 2005
 
3.
Stick it in Her(or his)Butt. Any number of other slang words for butt can be substituted for Butt, including booty, bottom, bangbox, bobs ur uncle, etc...
"Hey man i met this awesome Chick!" reply..."Oh YEA? did you S.I.I.H.B.?" or My girlfriend wont let me S.I.I.H.B.
av Bill Bigloo 7 april 2007