when one homosexual farts while another homosexual has intercourse in his ass. see also anal hummer.
Adam was taking it hard from Steve, so he decided to give him a butthole blowjob to help Steve finish.
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Its like a blowjob, but with a butthole. Yes, it sounds similar to anal, but I can assure you it is much better.
"Dude, *insert slutty name here* gave me an awesome Butthole Blowjob last night."