When a female overestimates her neck game and scrapes her teeth against your shaft during a blowjob.
Alternate; when a girl uses too much teeth.
Friend: Yo, I was helping Jessica study for her math test, and next thing I know she was about to give me neck.
Other friend: So? Does Jessica give that sloppy toppy?
Friend: Nah bro, all she’s got is toothy toppy. Still came tho.
Other friend: Nice...