any matter that is stuck between the left and right buttock, particularly coarse material that makes it uncomfortable to walk, sit, or perform daily tasks.
Guy 1: Dude stop scratching your ass when I'm around.
Guy2: Sorry man, after I went to the beach yesterday I got a lot of assgrit stuck between my cheeks.

---

After using the bathroom Dave felt uncomfortable when he realized there was still some assgrit lingering.

---

Sand is a common type of assgrit.
by Mr. Jenkins FoShizzle December 21, 2010
Get the assgrit mug.