|2.||everybody and their mom|
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.
|1.||everybody and their mom|
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.