Humdinger

A sexual move made to surprise the recipient. Can be done to male or female.

The individual doing it must place their lips on either the anus, vagina, or dick; they then proceed by humming loudly and quickly and deeply inserting two fingers into an available open orifice.

Guy 1: Hey how did it go with laura last night?
Guy 2: It was great, I didn't know she could hit such a high pitch!
Guy 1: what did you do?
Guy 2: I gave her a humdinger