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1.
A blowjob where the cocksucker hums.
Hummer Blowjobs:

H1 = A BIG hummer blowjob leading to cumswallowing orgasm.

H2 = A medium sized hummer blowjob that ALMOST ends in orgasm, but leads to a mind boggling fuck instead.

H3 = A little hummer blowjob that just gets you hard and then stops. You better start fucking ASAP!
by Jack Bozdog July 04, 2006