A female orgasm, or the effect that overcomes a woman's ability to make rational decisions because she thinks someone else is hot.
She had a beaver seizure and I had to wash my sheets.
Everytime he walks in the room, she has beaver seizure and can't think properly.
OMG, she took her shirt off and I almost had a beaver seizure.
Uncommon term of endearment for a female orgasm.
"Everytime she has a beaver seisure, we have to wash the sheets." or "She screams really loud when she has a beaver seisure."