One-downer Edit Meaning

1.

This person usually will have an even story or event worse than the situation you are or have experienced. The opposite of a "one-upper"

I was telling Maria about how I wrecked my motorcyle last week and Crystal, the one-downer, proceded to explain how she was in an accident and lost her leg, punctured a lung and apparenly the hospital food was shiite and came back to life as hedgehog..

See one-upper, bitch