When you are giving oral to someone and upon having an orgasm their bodily fluids over flow in your mouth.
"Hey, how did it go tonight? Had any luck?"
"Yeah, it was all going well until I gave him oral and he mouthbombed me."
"Oh that sucks."
"Yeah, it was all going well until I gave him oral and he mouthbombed me."
"Oh that sucks."
by TheAmazingPheonix January 19, 2017
Get the Mouthbomb mug.