used when sb has done sth which is very disgusting or met someone you think there is no one worse than that person to run into.
1
-I went to bed with your sister last night.
- wouldn't that suck!!!
2

- I met Jim Carrey today.
- Oh man, wouldn't that suck! There are lots of celebrities in whole world.
by Alishahbaz May 15, 2010
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