Someone who is so constipated, that when they go to release their waste, they force so hard that boogers leak out of their nose.
Guy: Umm? Excuse me sir, just to tell you, your coobeling.
Coobel guy: What does coobeling mean?
Guy: When someone is constepated, so they are pushing so hard, to release their waste, that boogers are leaking out of their nose.
Coobel guy: Oh, and yes I am coobeling. Thanks!