You say "got 'em" after someone says "What?" Means that you "got" someone, especially when you're in a conversation, mention that person's name, and then they break in saying "What?"
A: (talking to B) Sooo... I was with C the other day ...
C: WHAT???
A: Got 'em!
The "got 'em" joke can also be performed on purpose, for example:
Student: What's the answer to Problem blablabla ... (trails off into indistinguishable sounds)
Teacher: What?!?
Student: Got 'em!
C: WHAT???
A: Got 'em!
The "got 'em" joke can also be performed on purpose, for example:
Student: What's the answer to Problem blablabla ... (trails off into indistinguishable sounds)
Teacher: What?!?
Student: Got 'em!
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