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1.
this is a sexual technique in which two girls (usually) stick their legs in between each others legs resembuling two sissors.
"I was totally sissoring my girlfriend last night it was soo hot."
by seriously guess June 24, 2008
 
2.
When 2 girls fuck eachother using their vaginas as dicks.
Dick: Did you see that porno on the internet yet? The girls were sissoring!!

Dbag: Aww! I wish I was there!!!!!!
by trose1234 December 01, 2010