When someone does something exponentially stupid, you tell them to "Take a Lap".
At this point, this person will be ashamed and all of your nearby friends and peers will begin laughing heartily at the dumb person.
May also be used when someone tries to use a comeback but no one laughs and thinks poorly of him/her
RJ: Did you know that the polar ice caps are getting bigger?!
Moe: Wtf dude? No way, you're so dumb...
RJ: No your mom came in my mouth!
Moe Lexie and Mark: Take a lap douchebag.
RJ: Idk how to spell lap?
Moe: I laughed at her
Jordan: Your mom made me laugh!
Moe: Take a lap.
Jordan: Swim a lap!
Moe: Take another lap for that one.