Talking about something that happened with your mom the previous night.
Example:

Guy 1: Hey Bill guess what.
Guy 2: What?
Guy 1: I DID YO MOM LAST NIGHT
by MilkywayGalaxy 420 September 24, 2020
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To have your dad transgender and lesbian for your mother and to have your mother transgender and gay for your father
Hd was told by Myles and Dalton: “Yo Mom Gay and yo dad Lesbian
by Winner67 March 10, 2019
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90s comeback for roasts (old people still say it)
Billybobby: Your mom is so ugly that the dentist makes her lay face down.
Bobby: Yo mom!!
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Yo mom means that you had to run from yo mom
Guy: I got to run from yo mom
poop: why?
by Meme Girl Girl May 28, 2021
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