a portmanteau combining the words 'mommy' slang for 'mother,' and 'poontang,'(sometimes pronouced 'poodytang') which is slang for 'vagina.' Generally used in the context of MILFs, or making a 'your mom' joke.
Dad: MMM, MMM. That was some sweet, mommytang last night.
Son: For fuck's sakes, Dad, I hope you're talking about mom, not grandma. You know what, either way, what the fuck, dad?
Son: For fuck's sakes, Dad, I hope you're talking about mom, not grandma. You know what, either way, what the fuck, dad?
by Dark. October 29, 2008