Slash Gash and Terror Crew.
NF stands for Now Following on Twitter.
It stands for the Slash Gash Terror Crew
PM stands for Personal Message. In Twitter this is a direct message.
they are usually called slash gash terror crew SGTC for short
Short Message Service
'F' could stand for any number of things on Twitter. The widely used 'FF' on Twitter stands for Follow Friday.
OH stands for Overheard. As in "OH:What makes Twitter so popular?"
It was used as part of a competition to win an iPhone.
There isn't anything specific that this could stand for.
Around the internet it usually means, "No problem".
ÜT stands for the Über Twitter Client. The numbers after it stand for the person's GPS coordinates for their location (latitude and longitude).
I've heard it's "Don't Do That," but I can't confirm it. It seems logical.