- to complain in an annoying, crying voice - to make a long high unpleasant sound because you are in pain or unhappy

"Screaming" can also mean 'extremely', as in "it's screamingly obvious" (it's very, very, very obvious). It doesn't necessarily mean you are literally screaming. So a "screaming whiner" is whining excessively.

A person who complains very loudly

A whiner is a person who complains using an annoying voice, a voice that bothers your ears. Children can whine if they don't want to do something and the parents say, "Stop whining and do your homework." Scream can be a yell, especially if someone is frightened. A woman screams if someone tries to attack her. So if you mix "screaming whiner" the person is complaining in a loud, shrill (high and unpleasant), voice.