HELP for my Co-worker..Does anyone know what the work "nick" means in online cyber talk? (code word)

I hv a co worker who's 16 y/o son is gettin serious wi/ a 15 y/o girl, who is bad bad news. Whn they chat online they say things like "we need 2 "nick" some more & make ^ for the 30 mins we lost." very inappropriate..Anyhow this little girl is such bad news, & she has even gone as far as claiming tht her step brother d her, & now admits tht it was a lie..In the end it turned out that she liked her step bro and wanted him and his fiance 2 break up.. I feel bad for my co worker's son, cause he's an all around kid, but is beginning 2 chng his ways & it's been since he's gotten with this girl, & this is so hard on his mother,wht do u think? His mom has access 2 his Myspace which he is ok w/ but she jus found tht sum mysterious person tht calls himself bob posted a comment on her sons page askin him y wld he stay w/ his g/f after he finds out tht she wld lie about sumthing like tht... this "bob" person seems 2 hv great concern for the boy & seems 2 knows her also, ANY OPINIONS AT ALL?