When someone ask you a question over text and you dont want to ansewer it for personal reasons, you send them a sexual or random picture to distract them from asking you again. This can also be used to annoy someone by randomly sending the picture. Or it can be used to restart a conversation. (not reccommended)
Guy 1"Last night Kelly caught me in a text trap"
Guy 2 "Lol no way what did you ask her?"
Guy 1 "i just asked if she had sex with Amy and she sent me a picture of a big hairy dick."
Guy 2 "Wow a week ago she sent me a picture of two fat people having sex just so I would text her back but she didnt respond cause i was yelling at her."
Guy 1 "Crazy bitch"