Tabbed

It means something like "stupid" or "dumb" often used in ilocano.
"nag tabbed" is what mostly used when people do stupid things meaning "so stupid"

you pronounce it as Tab-bed with a silent e
usually goes with a hard "b" for that thick accent and more insulting

ex. 1
friend: how the fuck did you fail the test?
me: I forgot to write my name
friend: nag tabbed

ex. 2
random player being toxic in the game*
meanwhile my friend -> "You know what they call you in the philippines? TaBBBBeeed"
-john daniel