Whenever you see the marks of someone's feces on an object. This includes walls, floors, and ceilings, And you don't know how it got there.
This word is used in this matter, because no one would like to hear, "I Have Poop all over me!".
Sam: My Son had Mud Smears all over his shirt when I came back from work!
Don: Disgusting!
To fix a letter or word in a sentence. Because it was misspelled/miscorrected. Can be put before or after a sentence.
Bob: Hey! Wanna see that nrw mobte?
Paul: Uhh...What?
Bob: new movie*
Paul: Oh! Okay