Answer: thatsit

AnswerCrossword Clue
THATSIT"Bingo!"
THATSIT"Aha!"
THATSIT"Of course!"
THATSIT"We're done here"
THATSIT"All done!"
THATSIT"Now I'm really mad!"
THATSIT"I've had enough!"
THATSITStatement by a ticked off person
THATSIT"OK, I'm done"
THATSIT"You're right!"
THATSIT"Perfect!"
THATSIT"All done"
THATSIT"Eureka!"
THATSITBingo!
THATSITCry of frustration or inspiration