An idiom used to tell someone to get the fuck out.
Popularized by Doc, the old bar owner in The Boondock Saints, during the scene leading up to the bar fight with the Russian Mafia. Doc, who suffers from tourettes, commonly stutters and, therefore, mixes sayings (such as "People in glass houses sink ships"). Doc, who wants the Russian Mafia to gtfo, tells asks: "Well why don't you make like a tree then, and get the fuck out!"
NOTE: In order to sound authentic the quote must me said in an Irish accent
2. Chairperson: any more questions?
B: Yes: The speaker failed to tell us the real secret behind his vacuous smile.
Speaker: Yes I did. Why don't you stay at home more often? Do you want me to repeat that? Oright: WDY-SAHMO?
"Hey, we were going to get Chinese food. Want to come along?"
"Why don't you just make a pizza?"
"The United States need to send more, better armed troops to Iraq in order to win the peace and keep America's interests in the Middle East."
"Why don't you just make a pizza?"
I walked into the house
"hey did you bring the stuff I asked for?"
"Smirnoff Ice and strawberry condoms, you bet."
"ok let me just get changed"
I go into the kitchen and see Chris Hansen
"why don't you take a seat"
The command used by Chris Hansen, of DatelineNBC, before publicly humiliating and destroying would be child molestors on national television. No matter how much the child molestor wants to run, for reasons unknown to man, he cannot leave and always takes a seat.
Chris Hansen: Why don't you have a seat? Child Molestor: Oh shit! I swear I wasn't going to do anything with that 13 year old boy. I have to go now!
Chris Hansen: Why don't you have a seat right over there.
Child Molestor can't help himself, and has a seat.
A generalized comeback when someone suggests for you to do something. Especially when said something is:
a) obvious
b) your job but you'd rather it not be
Most effectively used when your friend is right but you don't want to give them the gratification of admitting as much.