El Trapo
When a female sexual partner of the past says the baby is yours, when it isn't.
Could also be when a female sexual partner says that she's on birth control and isn't. She may also do things like leg locking, forcing you to not pull out.
Term is used in context with "crazy bitches". Get away immediately if you suspect "el trapo".
Man #1: "yo dude I can't believe the kids mine. I swear it happened only 8 months ago."
Man #2: "sounds like el trapo to me man, get that shit tested."