When someone is rough around the edges, they're not exactly old as fuck, but the lives they've lived have led to old as fuck qualities. Primarily in how their body may look or perform.
or
Physically diminished; jacked up
"Chuck Liddell looked rough around the edges when he came out of retirement."
A rough muff is a vagina that is overgrown with pubes i.e. opposite to a shaven haven
Friend one: I love that, that Steffi girl is just full of roughy muff goodness
Friend two: You're sick! Shaven haven all the way
Friend one:....nowt wrong with a rough muff