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When you sniff a seat that someone else just used, especially if it's on a bike. You do this to check if they had something gross on them, like a greasy burger or a sweaty butt.
I gabooned the seat and immediately regretted it. That guy had a double cheeseburger and a foot.
I sniffed the seat and decided to walk instead of ride.
Gabooned the bike seat and got a face full of fries. Classic.