Help......About " The West Wing" (4)

[english-learner]

How do I understand the phrase " trip over your mouth " in this context? Can you give me a few examples about how to use this phrase? Thanks a lot for your help!!!


MANDY
You should get to know him.

JOSH
I have enough friends.

MANDY
Not these days you don’t.

JOSH
Please, Mandy. It’s not like these people were in our camp to begin with.

MANDY
That’s right, Josh, and they’ve been waiting for you to trip over your mouth and you handed it to them. It’s Christmas morning for Mary Marsh. [pause] You’re a Fulbright Scholar, are you honestly the only adult in America who doesn’t think you’re about to be fired? Do what Toby’s telling you to do.

JOSH
Did you just call him Lloyd?

MANDY
Who?

JOSH
Senator Russell.

MANDY
When?

JOSH
A minute ago. You said "What do you wanna know? Is-is Lloyd gonna run"?

[Tdol]

Say something wrong or stupid.