An idiom referring to the ejaculation of sperm after a male masturbates ('laughs'), particularly self centred bastards on webcams. Also see matting and to matt oneself
'He just stripped off and then laughed till his sides split!'
'Dude'
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A verb meaning to wank oneself, specifically on a webcam.
'And he just pulled down his boxers and matted right in front of me!'
'Dude'
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