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Noun: (slang) A female who tends to get little more than the head of a penis in her mouth while performing oral sex.
1. The top of her head looks great but she is a half-bobber.

2. She was a half-bobber so I had to dump the bitch.

3. My last girlfriend was a half-bobber, she was always leaving me with blue balls.
by KDH August 02, 2006
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