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The continually faster beeping sound made by someone as they get closer to the person or thing they are going to hump (not the sexual way, just the pelvic thrust you would do to a sibling)
Lindsay's humpdar was far more acute than her sister's.

Lindsay's humpdar could be heard from across the street as she saw her sister walk into their home.
by lindsay matthews November 23, 2007
2 7

Words related to humpdar:

hump humping radar revoltion sibling love.