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1.
To not say anything in response to someone's action or speech because you have nothing good to say; as in the Disney film "Bambi", when the character Thumper is scolded by his mother for saying something unflattering to Bambi.
"Hey, what did you think of my poem?"
Total silence.
"Aw, man, you're thumpering me!"

or

"What did the girls think of your dress?"
"They thumpered me."
by Blackbead February 04, 2010