Top Definition
1. When a senior (usually highschool) has some form of sexual intercourse with a female of a lower grade (Junior, Sophomore, Freshman)
"Ashley wants me dude. I'm gonna slip her the senior d. Yeah I realize she's only a freshman but don't worry about that."
#sex #slip her the senior d #bitty #wants #an #older #guy
by PolishThug March 31, 2010
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