The eye-opening clip begins showing a woman with her leggings pulled down to reveal her bare bottom, while her compatriot kneels behind her.
Coaxed on by the crowd, a bystander begins to pour a beer down her lower back, sending the liquid running down through her bum crack.
Luckily however, not a drop goes to waste as a bold volunteer gets his face up and into the action to suck the liquid from her rear cavity.
The clip ends before the deed finished, leaving viewers on a cliffhanger as to whether he finished his drink.
Since it was uploaded yesterday evening (October 16), the video has received more than 3,000 retweets and almost 6,000 likes on Twitter.
“Hahaha, this might be one of the trashiest things I’ve ever seen. Go on Buffalo!” said one viewer.
Another comment read: “Okay going to a Bills home game just jumped up my list of things to do – party time.”
Perhaps buoyed by their fevered home support, the Buffalo Bills ran out convincing 45-16 winners over the San Francisco 49ers in New York.
But this bloke wasn’t the only one caught misbehaving while watching the NFL this weekend.
An unfortunate Miami Dolphins fan was caught on live television mimicking licking his fingers and putting them up a woman’s bum.