Telling lies to others or feeding someone a line of bullshit.
Stop fucking around, you damn liar, you're the one full of Champú... (The original example uses a derogatory reference to the PSUV, Venezuela's ruling political party, as an insult).
To feed someone a tall tale, a line of bullshit, or sweet-talk to convince them of something false. Usually used in the phrase meter un Caltri, the term likely stems from the word cartridge, referring to printer ink cartridges.
I talked to Clemente yesterday, and he came around trying to feed me the Caltri that he did not go to the party because he fell asleep.