The peculiar noise made by ones mouth when going down on your partner's junk. This occurs when the suction becomes too strong.
by Elantragirl May 30, 2009
Nikki: *trumpet noise with mouth*
Caroline: Jesus, that was a mouthfart.
Nikki: (pauses) *trumpet noise again*
Caroline: Jesus, that was a mouthfart.
Nikki: (pauses) *trumpet noise again*
by Ms. Ruff March 04, 2004