To Groban someone is to fart while receiving a blow job from someone and pushing their head down to choke on your dick at the same time.
This term comes from the fact that Josh Groban looks like he is a dick and would most certainly cram someone's head down and fart during a blow job.
My chick complains that I fart too much, so I made her choke on it whike blowing me and farted at the same time... I totally Grobanned her.
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