Groverino's definitions
Related to New York speak: going onto the subway and so losing wireless connection. Usually means that the person will be unavailable for a while (even up to an hour and a half).
text message reads: "going underground"...Note: Don't give up on your friend for several days, just for a few hours until they gain a wireless connection again.
by Groverino September 18, 2012
Get the going undergroundmug.