I presume pajero is slang because “hacer la paja” or “hacer paja” is slang for masterbate. The FCA example is “fica” in Italian? Similar to “figa” in Spanish?

As a foreigner in Spain I really enjoyed learning slang and then speaking inappropriate double entendres[1] - acting innocently as though I had made an honest mistake - entertaining whoever I was talking to.

Or honest mistakes too: I remember being laughed at for saying I was being followed around by a bunch of little penises when I meant to say little chickens.

[1] https://en.m.wiktionary.org/wiki/double_entendre “The phrase has not been used in French for centuries and would be ungrammatical in modern French”