A state of agitation, confusion, or excitement.
The condition of being flustered.
To make or become nervous or upset.
To make or become confused, nervous, or befuddled.
To fluster is defined as to make someone become agitated, nervous or confused.
When you ask a person questions he doesn't understand and he gets nervous, this is an example of a time when you fluster him.
(dated) To make hot and rosy, as with drinking.
(intransitive) To be in a heat or bustle; to be agitated and confused.
Origin of fluster
From Middle English flostring agitation probably of Scandinavian origin pleu- in Indo-European roots