a word spit out at any given time or place when someone (most likely a complete idiot) has absolutely no idea what to say
Hilary: Have you beeen havin a affair?!
Bill: uhh...
Hilary: Tell me! Who have you been doin stuff with lately?
Bill: YOUR MOM!
Bill: uhh...
Hilary: Tell me! Who have you been doin stuff with lately?
Bill: YOUR MOM!
by michael jackson November 21, 2003

Your mom is the first defense is sixth grade boy humor, it’s constantly overused and makes you question the sanity of society as a whole. Your mom is also commonly used by lesbians with no humor and are trying to be funny, yeah I’m talking to you.
Example 1
6th grade boy 1: guess who I did last night
6th grade boy 2: who?
6th grade boy 1: YOUR MOM!!! OOOOOOH
Random kid passing by: wtf?!
Example 2
Random person: hey wanna hang tonight
Lesbian with no humor: sorry can’t tonight I’m busy doing…
Random person: busy doing what?
Lesbian with no humor: YOUR MOM!! OOOOOH!!!
Random kid passing by: How do I keep hearing these conversations?!
6th grade boy 1: guess who I did last night
6th grade boy 2: who?
6th grade boy 1: YOUR MOM!!! OOOOOOH
Random kid passing by: wtf?!
Example 2
Random person: hey wanna hang tonight
Lesbian with no humor: sorry can’t tonight I’m busy doing…
Random person: busy doing what?
Lesbian with no humor: YOUR MOM!! OOOOOH!!!
Random kid passing by: How do I keep hearing these conversations?!
by Littlegaykid February 18, 2022

she is your mom duuhhhh
by whip with that food November 29, 2018

by Qveen_Kayla.29 November 26, 2021

1. A very nice lady that makes meals for you and your family. Acts like she enjoys your friends company more than your's.
2. The response a middle schooler would give you, goes well with "who asked","Joe who?", and "To your left".
2. The response a middle schooler would give you, goes well with "who asked","Joe who?", and "To your left".
by Soupy Man 69 April 27, 2021
