When a person is getting head
, and shoves his (or "her" if it is a transsexual
) cock deep into someone's mouth, making the person choke and puke, but keeps his cock in place and holds the head-giver's mouth closed, forcing him/her to gag more on the cock/puke. The victim has received a gagnon!
Vincent didn't know what what hit him when the trannie hooker he hired got rough and gagnoned him. Needless to say, the tip doubled...