Quick definitions from WordNet (bumper)
▸ noun: a mechanical device consisting of bars at either end of a vehicle to absorb shock and prevent serious damage
▸ noun: a glass filled to the brim (especially as a toast) ("We quaffed a bumper of ale")
▸ adjective: extraordinarily abundant ("A bumper crop")
▸ Also see bumper
▸ noun: a mechanical device consisting of bars at either end of a vehicle to absorb shock and prevent serious damage
▸ noun: a glass filled to the brim (especially as a toast) ("We quaffed a bumper of ale")
▸ adjective: extraordinarily abundant ("A bumper crop")
▸ Also see bumper