Answer: sezwho

AnswerCrossword Clue
SEZWHO

"Oh yeah?!"

SEZWHO

Words after "Oh yeah?"

SEZWHO

"Oh yeah ... you and what army?"

SEZWHO
"Oh, yeah?"
SEZWHO
Question following "Oh, yeah?!"
SEZWHOGruff rejoinder
SEZWHOInformal response to a dubious claim
SEZWHO"Oh yeah?"