Mallet Dick 

When it's wider around than it is long. As this prevents actual penetration from happening it forces the owner to pound around in the general vicinity of his target, hence the name mallet dick.

Lady: Damn he hit me with his mallet dick last night, I'm sore from my knees to my belly button

Mallet Dick by #Splashback March 19, 2015

Dick Mullet 

When a man has a thick happy trail leading to his freshly shaved genitals. It's a party on top, business on bottom type of look.

Dude, I just got a Dick Mullet!

Dick Mullet by TheGang608 February 27, 2015