When a man jizzes in a girl's (or guys...) hair and they don't wash it out. They walk around with white cum all over their head, that is a helmet pie.
For our anniversary, I gave Jen a helmet-pie, I think she looks good in white
by Kohanim March 08, 2004
1 more definition
Pie made from the orange Jack-O-Lantern helmet that Charlie Brown wore in the minnie-bike race; the toasted seeds of which are also a fall favorite.
Enough of that there turkey ma! I gotta save me some room for that helmet pie that aunt Nadine brung!
by Bruce Bever November 09, 2003