Top Definition
when you are riding in the front seat of you're moms car and she has to hit the brakes or do some crazy manuver to avoid something, then she stretches her arm across your chest holding you in your seat as if she was going to save your life.
dude some jerk whipped out in front of my moms mini van and i got the mom bar.
by drew2258 August 10, 2011

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