Webster:
1: soft miry land that shakes or yields under the foot
2: a difficult, precarious, or entrapping position : a predicament ;an awkward, complex, or hazardous situation.
In a sentence:
‘The party was once again facing its quadrennial quagmire: the candidate sufficiently liberal to win the nomination would be too liberal for the general election.’
My Definition: Some shit. A real sketch situation.

In a sentence:
“You’ve gotten us into a real fuckin’ quagmire here, Vinny”