Slang, usually past-tense, for ejaculation. Many say it originated with fans of the Foo-Fighters (possibly may have even started with Nirvana) probably in reference to the expression of frontman Dave Grohl when performing, as his intensity resembles that of a person having an orgasm. While this origin is disputed, many say the word just sounds appropriate for the act, which most likely explains why it caught on.

the art of remembering an arousing occurrence or some porn you watched while masturbating, often handy if you have no porn or your in the shower