A person who carries themselves with a sense of superiority solely derived from a position of authority, or some other unearned quality.

Whereas the person with big balls has the skill or physical prowess to back up their actions; the Fluffy Nuts merely appear big, but are actually only fluffy.

Scenario: construction worker works on ladder, group of authority figures walks up and watches.

Construction worker to fellow construction worker, later:

Man, I was trying to get my job done, but a whole gaggle of Fluffy Nuts came up checking out my ass while I was trying to work! So, I got down off the ladder

A man who messes around with other men, but no one would ever know by looking or talking to him. Used by gay black men to identify masculine gay men or DL Brothas.