Flustered and pompus, like you would be if someone asked you a question you find incredibly offensive. Happens a lot with teachers and snobby upperclassmen.
The name given to men, especially those of scottish origin, who leave a party early to go home. The implication being that the man would prefer to go home and do the ironing than hang out with his mates.
Stu! Don't go home again! Iron your shirts another day! I am changing your name to Shirty McIron.