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2.
It is the most common comeback against a Yo Mama joke. Used in an emergency when one can't think of anything to say. Using it automatically results in Fail for being such a lulzkiller. Please note that this is NOT the ultimate comeback
Bob: Btw, can you get my wallet for me? I left it on your mom's dresser.
Drew: My mom is dead
Bob: That explains why she wasn't screaming so much
by Sundance Kid September 06, 2007

Words related to my mom is dead

mom dead death is joke lulzkiller momma my your
 
1.
Something used after a yo mama joke, not only to make them feel like crap, but also to ruin everyones fun.
Joe-Yo mama is so poor, she goes to Kentucky fry chicken's to lick other people's fingers.

Chris-My mom is dead...

Joe-*looks sadly at Chris*
by Roger D January 23, 2005
 
3.
It can be something said after a "your mom" joke, but that doesn't mean it isn't true.
And it hurts more when your friend thinks that your just trying to make a comeback, and keeps going...
Jeff: Does your mom want her underwear washed with bleach or without?

Carl: My mom is dead.

Jeff: Should I wash the body, too?

Carl: *beats the shit out of Jeff*
by Lolwhat? March 10, 2011