It's a
sarcastic, humorous, & somewhat bitchy thing to say, when somebody keeps
complaining about an event that
happened, or a situation, & they just need to get the hell over it.
Example one -
Girl one: *crying* My boyfriend John broke up with me yesterday!
Girl two: That's terrible, I'm so sorry!
(...7 months later...)
Girl one: *crying* I still can't believe John broke up with me...
Girl two: Oh for fucks sake,
build a bridge and get over it.
Example two -
Boy one: UGHHHHH! I'M SO HUNGRY!!!!!!!!
Boy two: Dude, you've been
complaining for 30 minutes about your hunger. Nobody cares!
Build a bridge, and get over it.