To "Kahl up" means to be in an alternate world due to the zaa. People that "Kahl up" tend to rip the za on a tuesday night in a room by themselves with their eyes squinted so that everyone can see.
Yo, are you Kahl'd up right now? Ya man I had a bad day, I had.
OMG you are so Kahl'd right now you can barely open your eyes.
To be Kahl'd, or to. Kahl up means to be high off of edibles or a dab pen.