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'Humping air' can have 2 meanings:

1. Noting someone else that he/she is making stuff up.

2. Confirming of admitting you got something wrong.
1. "You're telling me that you can lift up a car with one hand? You're humping air, mate."

2. "Mach 1 is 1000 km/h, right? Or am I humping air now?"
by SecretHidingPlace March 20, 2010
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