A smooth talker. A hit with the ladies.
"That guys a real Mervinsmervin"
"You got that girls number? Wow you're a total Mervinsmervin!"
A vile and disgusting object, of which no one wants to associate themselves with.
Related to 'la douche nugget', the gunk found in the plug hole of a french shower.
"Becky, why does he think its cool to wear snapback and shades all the time?"
"It's simple, its because he his a douche nugget"
"That chav thinks it's funny to knock over his neighbor's bins... in reality he is just a douche nugget"