A retaliatory action where a man jerks off in a girls purse, closes the purse, and then proceeds to shake the purse so all the contents inside have an even coating of jizz on them.
Dave: Did you hear what Mike did the other night to that chick he hooked up with?
Mike: No man, what did he do?
Dave: Apparently, the girl stopped having sex with him once her boyfriend called and she decided to leave. Instead of being blue balled Mike jerked off in her purse, zipped it up, and shook it up in retaliation while she was in the bathroom cleaning up.
Mike: Holy shit, he shake and baked her real good. I bet she was pissed.