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1.
More than just everybody. Same as adding 1 to an infinite number. Noun, never plural, always singular.
I tried to buy tickets to the Motley Crue tour, but everybody and their mom was there.
by megatron5150 April 04, 2005
39 8
 
2.
Used in place of "a lot of people"
Person 1: Did you see Jenny's "25 things" note?
Person 2: Yeah! Everybody and their mom is making one.
by Jamaal and Boquifa February 02, 2009
24 1