Hit-man or mafia soldier. Button men usually do the dirty work/muscle work for their mob bosses.
For numerous reasons, button men have very limited direct contact with the mob bosses/family heads- there are usually buffers between the button men and their bosses.
I'm a button man...When the boss says to push a button on a guy, I push a button...
The ladykiller, Don Juan, Cassanova bastard who always fucks the hottest bitches. The butterman has all the cash, the hot car, basically he's the guy who's got all the shit you wish you had.
"Dude, I was wheeling that hot skank until the butterman showed up, took her into the ladies room and screwed her ass right therein the stall."
"Man, you just can't stop the butterman."
When you are about to plug a girl, but you are drunk so your johnson is a little soft. You shove it in anyway, but during the first few minutes your johnson looks wrinkly and old. Eventually, you become fully hard and the shaft is smooth and young-looking.
Andrew: After the party I took a girl upstairs and gave her the business. It took me forever to get hard and I couldn't keep her waiting, so I did a little Benjamin Buttoning in her clap trap.
Evan: Sweet!