Something that Is not uniform to what everyone wears. (In this context, clothing) can also apply to personal style ( a way of being unique someone's individual style). Does not mean they are "dirty" just looks like a mess from someone looking in from the outside.
P1- Yo that artist chick has a dirty style.
P2- nah manthat chick swag is basic.
P1- nah, I'm talking about her art it got dirty style
Is when someone else left the shop bathroom in such a stench and mess, you go into the closed down office ladies room and drop a deuce in a toilet that's been turned off because of a broken pipe.
Worker 1: You went in the girls room up front? That's been closed for six months because of that broken pipe!
Worker 2: Well now their not using it for at least a year after I dropped that dirty fergie "office style" on them!