Top Definition
Ramming a girl with a pool cue then beating her father over the head with it.
"DUDE WTF, you went to 15th base with my sister last night and now my dads in the hospital!!!"
#15 #15th #base #15th base #1st base
by Dillon Labrek August 16, 2006
threesome with parents
Bob: "My gf caught me at 15th base last nite!"
Bobbalina: "That's awkward, what'd she do - turn it into sixteenth base?"
Bob: "17th"
#14th base #51th base #13th base #015th base #051th base
by S1245 August 16, 2006
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