British, very informal, American, very informal

someone who is always trying to seem more clever than everyone else in a way that is annoying.

OK, smart-arse, do you have a better idea?

• be thin on top
• be three sheets to the wind
• be thrilled to bits
• be tickled pink death
• be tickled to death
• be tied to mother's apron strings
• be tied to your mother's apron strings
• be tight-arsed
• be tight-lipped
• be tired and emotional
• bet life
• bet on it
• be too clever by half
• be too close for comfort
• be too close to call
• be too good to be true
• be too hot to handle
• be touch-and-go
• be treading on eggshells
• better half
• Better late than never.
• better late than never
• better off
• better part of
• better part of something