When one man has anal, vaginal, and oral sex with one woman during one session, in any order. Also known as the trisexta.
Will: Want to go the bar tonight?
Bill: Not before 11, I am going to one man gang bang my girl in a bit.
Bill: Not before 11, I am going to one man gang bang my girl in a bit.
by DrSussy October 7, 2009
Get the One Man Gang Bangmug.