What's the meaning behind some of the stickers?

[Some Curious Person]

I guess that Lunacy is a play on Luna being a moon, but why is MatI a top hat, and wtf is even Horrifying and TMI supposed to be?

 

[DiggieSmalls]

Islamic content was a user?

 

[Internet Explorer]

They're all fun and creative ways to point out you're a nigger.

 

[DerKryptid]

MATI is a reference to Alog @AssDust and his irrational fear of having a top hat shoved up his ass