The act of being overly nice and polite to the parents of friends/acquaintances, especially mothers, when you are in fact brash and filthy around your peers.
See also: dad spooner
, granny grinder
We needed to leave but Kevin was busy being a mum bummer and we got there ten minutes late.
I'm wasn't mum bumming, she was just asking me all these questions.
ayon kay barkbat
ika-22 ng Oktubre, 2009