It's pretty much a straight pull from our flight following information command (FLIFO). When we pull it up, it's displayed a little bit better, something like this: (note this isn't a real display, I pulled information from a few flights to make an example that shows everything)

F:251/27MAY
IAD/1723CT/OFF 623P .04L RAMP
PDX/1723CT/ETA 819P .14E RAMP
IAD/1245CT/1345-2000/PROB DLYS/DVRT/CNCL-THUNDERSTORMS

The first line tells you how many minutes late (L) or early (E) the flight is/was/expected to be, and the delay reason. RAMP would show up as "Ramp Service" on United.com or on the easyInfo displays at the gate. Other examples:
CUST - Customer Service
FACL - Facilities
ARPT - Airport Operations
WX - Weather
ATC - Air Traffic Control
MECH - Aircraft Servicing

The final line refers to what calls up in our command as a "DPAM", or advisories for an airport that is either the arrival/destination/stopover point of the flight number.

Happy Travels!