np = no problems (inga problem)

lol = laugh (ing) out loud (ha ha)

brb = be right back/bathroom break (snart tillbaka)

rofl = rolling on (the) floor laugh­ing (ha ha, ännu roligare än lol)

btw = by the way (på tal om det?...)

wtf = what the fuck (Men vad fan)

thx = thanks (tack)