when you feel like you're going to take a crap but nothing or almost nothing comes out.

lil mad is like big mad but the opposite, you mad but not mad to the extent of pullin somthin

When you are too edgy to say ghost shit, so you say the polished version of it.

So like, when you are at school, and the teacher doesn't want you to cuss, you say ghost crap. But I have no clue why people would you say "ghost crap" at school.