'suck a man' is an insult given to a male.
'whatever, go suck a man fagot'

or

one can also use it in multiples

'go suck 38 men you homo'
by the j to the meff January 25, 2010
Another and more confusing way of saying "suck my dick"
Yooo "suck my mans"
by Whydoihav2 June 14, 2018
Verb;

Made up in older times by a stocky, grey-haired lumberjack named Ol' Danny Boy.
Now modernly used as a violent term when extremely mad, usually shouted with extreme prejudice at someone for a minor inconvenience or insult the shouter would have taken offense to.
(Verb)~

(you arrive at the theater and are dumbfounded and furious to see that the movie you wanted to enjoy is sold out)

customer-What the hell! I drove five miles to see this movie and its sold out just great!

employee- Sorry sir better luck next time.

customer-You know what, Go Suck a Man's Dick!
by Quiteabod November 13, 2013