What is One-downer?
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..
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