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1.
The term given when a man has intercourse with a woman on her menstrul cycl
Bob was so eager to have sex with Sally, he did not mind ridding the red slide.
by ASanchez September 26, 2006
 
2.
A code word that you use at an amusement park, when you see a hot girl you call her a red slide.
"hey dude, I want to go ride that red slide over there"
by KRAy_Z_n1nja August 14, 2011