"share the wealth" in the warez underground; meaning either that a file is directly accessible from the link ("STW: Final Cut") or used to entice someone to share the files they have.

Someone who used to be a potential girlfriend/boyfriend, but no longer is.

STW means "Spread the Word." This is an informal abbreviation used more in text messaging than in verbal communication.

Soapy Tit Wank.
The act of having oneself wanked off between a lady's breasts. There are two versions "North" and "South". The view for the lady is rather poor in the South version.

Smoking That Weed

Quite simply, a soapy tit wank.

STW means “Suck This Weenie”, basically you see a girl and you give her a shout out “STW”, she may come running to you, ready or tell you to piss off.