9000th base 

When the sex you had was so good that it's over 9000.

Bill: I had sex with Jane last night, and I hit the 9000th base!!

Bob: You really need to stop watching those Dragonball Z episodes...

9000th base by MrsAmazingful April 4, 2011

over 9000th base 

When her power level is over 9000 but you go ahead anyway.

A: I was with that girl last night, but her power level was over 9000
B: What did you do?
A: Fucked her anyway.
B: WOAH!!! Over 9000th base. You are so awesome.

over 9000th base by Davemaybelikesbananas January 2, 2010