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1.
v. To give someone the "sidewall". A sexual act where, when banging a chick from behind, the man turns his body to the side and rams the outer lining of the vaginal walls.
Give her the sidewall, dude! The sidewall! Yeah!
by Alana Riveras January 19, 2005
 
2.
Side view of a female's cleavage.
"Damn, that string bikini is showin' off her sidewalls!"
by Krazzzzzzy Kyle March 21, 2004