What's on your mug?

"I'm in" is an alternate form of "count me in" which means "include me"

- I'm feeling hungry, so I'm going to order pizza. Who's in? - I'm in

By Siemprejorge

I will participate.

Keisha: "We're doing some trail improvement work on the south slope this Saturday at 8:30 AM—will you help?" Samara: "I'm in."

By leannain-facal

What a man says after placing his Tiny Rick into his lady's gapping chasm.

Her: Oh baby, give it to me! Him: I'm in. Her: oh...😢

By Smackum Yackum