To claim a seat or spot.
(Similar to 'shotgun' although not in a car,)
"You can't sit there, I got FIVERS.
by anonymous Jul 20, 2003 add a video
Derived from the phrase five by five which is old radio slang for loud and clear. Meaning that things are in proper or satisfactory operational or working order.
Last Entry in a Log:
2400Z Station Fivers