More than a blowjob; it's when a girl actually hums (thus vibrating her lips) when her mouth has encased your engorged penis or balls.

when you've done something so cringe you can't stop replaying it in your head and it stops you from getting on with your every day life

1. Even better than a blowjob, it's when the person actually hums/vibrates their lips while their mouth is around your cock.
2. One of the least fuel efficient vehicles on the Earth.

A hilarious name for oral sex. Often used as a joke, when people think the Hummer H series vehicles.

A blow job which incorporates a gentle humming while performing the duty to increase stimulation.

1. A civilan version of the military vechicle Humvee. Hummer's are produce by the General Motors Company. Currently there are two version's H2 and H1.
2. A Blowjob when the girl hums during the BJ

No, not the SUV, an extremely pleasureable type of oral sex which involves the female humming to create a vibrating sensation in the penis during oral sex.