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2.
When your mother cuts a loud fart.
Mrs. B. tried blaming the family dog when she cut a mom fart but everyone at the table knew it was her.
by jokingkong January 15, 2011
 
1.
Farts that come out of your mother, usually they tend to be really loud. Note that Mom Farts do not smell whatsoever. The reason behind this has not been discovered yet.Mom farts happen when you least expect them. Although a common time for them to occur is when something very exciting happens.

also, Mom's try to deny the fact that they had just farted.
Jigglypuff: WTF Mom, did you just fart?
Mom: No.. What give's you that idea son?

Mom Farts
by TuttiPudd April 22, 2009