This is slang for trying to take advantage of someone. Similar in meaning, “Trying to pull a fast one.” Or “Trying to pull the wool over my eyes.”

What are you trying to do/convince people of? (Implication that this is not true or inappropriate) . What are you trying to pull? This soup is not even hot. What are you trying to pull? I clearly got to the counter before you. I should get served first. What are you trying to pull? I gave you a $20. I want my change.