Roister Doister Edit Meaning

1.

a foolish braggart

true origin is a comedy by Nicholas Udall called "Ralph Roister Doister" written a.1553

Roister Doister is my name,

A lusty brute I am the same

See braggart, brute, bragger

2.

bit of a "player"; generally with women but can also be used in business. Origins - Only Fools and Horses.

"Rodders, I'd never of guessed, you ol' roister doister."