The word "laughin" is most likely a colloquial or informal variation of the word "laughing," which means making sounds and showing happiness or amusement.
wat a nonsenx performanx, we» v been managin d sluggish startin game rite frm half time before Wenger scattered and left matersaker effort in vain wit his rubbish substitution, i do nt just knw y he can not jst leave lacazete to play full time, mtcheww am really tired for dis embarrassment, laughin at me rite now at home. (justarsenal.com)
- NATO is «obsolete» (me: made big waves in the baltic states which have russian mayoritys too, poland and others who fear the russians after their politics in the ukraine while Mr P. made laughin all day) (evo.co.uk)