The act of men sitting with their legs so widely spread that the person next to them has an estimated 0.5 seat left and can, also, take a fairly accurate guess at the size of their genitalia (which, newsflash, is generally not in need of a 20 cm leg-gap, don't flatter yourself).
"I have an armrest-sized-bruise because the guy next to me was manspreading so much that I had my thigh squished into the armrest the entire busride"
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