"I believe you, I heard it."
It's a playful way of acknowledging that you believe someone, even if they're telling you something surprising or unbelievable. It implies that you've heard this information before, either directly from the person or through other sources.
Here's a breakdown:
* Te: "You"
* lo: "it" (referring to the information being shared)
* creo: "I believe"
* oíste: "you heard" (past tense)
Example:
* Person A: "I saw a UFO last night!"
* Person B: "Te lo creo oíste. Los extraterrestres están por todos lados." (I believe you, I heard it. The aliens are everywhere.)
The phrase can also be used in a more sarcastic or ironic way, suggesting that you don't actually believe the person but are pretending to for comedic effect.