1. a mental or emotional breakdown
Usage: informal
2. a collision or crash, especially of vehicles
Usage: informal
3. something very funny or amusing
Usage: informal

Examples

• The stress of finals caused him to have a complete crackup.
• She had a nervous crackup after working too many hours.
• The crackup on the highway blocked traffic for hours.
• There was a minor crackup in the parking lot.
• That comedian is a real crackup.
• The movie was such a crackup that everyone was laughing.
• His jokes are always a crackup at parties.