let up

to slack off after a period of doing a reasonably acceptable job in an activity.

athletic kid: come on! only 5 more miles!

fat kid: fuck that!

athletic kid: dont let up on me now!

let up by domiyan December 4, 2012

let up

When you expect worse than what actually happens. A pessimist's let down. Can cause happiness and joy, or the anger and frustration brought by a let down.

I seriously expected to do worse on my test. God, what a let up!

let up by aslan8 December 16, 2005

Let me up, Dolly 

a mild expletive of surprise, usually used to express response to the unexpected.

"You're having triplets? And they're mine? Well, let me up, Dolly!"

Let me up, Dolly by h202 February 7, 2010

Let's dress up and travel together 

Is technically what people usually do after literally coming out of the closet.
A slang term or euphemism for "dating" originated from the Taiwanese dub of The Owl House, where Amity says "我們盛裝出遊吧!" which translates to "Let's dress up and travel together!"
But can also be used as a term for openly experiencing LGBT culture after coming out of the closet.

Now that i'm out of the closet, and there's a Pride Parade tomorrow, let's dress up and travel together!
I came out a week ago and have been dressed up and traveling ever since.

Let's dress up and travel together by Sir. Kick December 16, 2021

let me look up the definition of collect 

A sentence uttered by an individual who knows he/she is full of shit and is getting called out for it, so he/she panics and resorts to petty, manipulative methods to evade the original question.
Used in a Blaire White vs. Onision live debate on YouTube by Onision.

"Did you or did you not collect photos of underage girls to put in your videos to rate or to call fat or skinny or any of that shit?"
"Let me look up the definition of collect."

let me look up the definition of collect by Zomboya July 19, 2017

Let’s split up gang

Something said by idiots in horror movies

Fred: Let’s split up gang
Everyone: BRUH

Let’s split up gang by Sub to Red Cultist May 29, 2021

Let's fog up the windows 

To have sex in the car.

Hey babe, let's fog up the windows tonight!

Let's fog up the windows by Orale weyy June 24, 2018