Javelined

[Sarah]

When you put your mouth over a guys penis when he is soft, as if you are deep-throating, and then wait for him to get hard and he pelvic thrusts with a force greater or equal to the [eruption] of Mt. [Vesuvius], [impaling] ones throat.

Alternatively,

When you force a persons mouth over your penis when its soft and you become hard thus causing them to gag and tearing their throat lining causing a series of recurring hospital visits.