Full of shit

(Adj.)
1. Saying untrue, unreliable, incorrect, made up, often nonsensical and unbelievable lies to try to make oneself not look like a giant piece of shit. (see also piece of shit, bullshit artist)
2. One who is undependable, unreliable, fake, untrue, a straight up liar
3. Constipated to the point your eyes turn brown and breath reeks of fecal matter.

(Verb) to be-
1. To make promises, plans, or claims all the while knowing damn well you will never follow through. (see also blow smoke)
2. To be too afraid to be honest & say it like it is because one is soft. Not unlike a scared little girl.