Top Definition
the act of defecating on ones head while ejaculating on top of that then having one say "BRAIN BLAST"
"Dude, so Clara finally let me do the Jimmy Neutron Steve Martin on her yesterday.... it was amazing!"

" Karl did the most sensual thing to me yesterday, it's called The jimmy Neutron Steve Martin and i'm definitely letting him do it again to me tonight!"

"Dr. Jones told me that not only is the Jimmy Neutron Steve Martin good for your hair, its also good for your skin!"
by drunken_nights May 21, 2010
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