colársela

A colloquial expression built on the reflexive colarse (to slip something past someone), meaning to pull a fast one on someone, to trick or deceive them successfully: me la coló sin que me diera cuenta. The la refers to an unspecified trick or lie being "slipped past" the victim.

• Me la coló con esa historia tan absurda. — He pulled a fast one on me with that ridiculous story.
• Intentó colármela, pero me di cuenta a tiempo. — He tried to pull one over on me, but I caught on in time.
• No dejes que te la cuelen con contratos que no lees. — Don't let people trick you with contracts you haven't read.

The pronoun la is fixed and doesn't change to agree with what's being tricked — colársela always uses la regardless of the specific lie or trick involved, since it's a set idiomatic pattern.

Often confused with engañar.