Gus: Hey Peabody have you been working in the garden again? it looks like you got dirt under your nails.
Peabody: Geez errr that's just Mudfinger, Clarice needs to stop buying our tp at the five and dime, that shit is see-through.
M. is used for individuals who has regular and/or intentional intercourse with dirt or mud. It is a strong word which can be offensive in certain contexts.
- That guy seems to like mud unusually much.
- Yeah, that's because he's a mudfucker