Definition of het up adjective from the Oxford Advanced Learner's Dictionary

 

het up

 adjective
adjective
BrE BrE//ˌhet ˈʌp//
 
; NAmE NAmE//ˌhet ˈʌp//
 
Excitement, Anger
 
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[not before noun] het up (about/over something) (informal) anxious, excited or slightly angry What are you getting so het up about? He was all het up about the extra cost. She got rather het up with some of the journalists. See related entries: Excitement, Anger Word Origin mid 19th cent.: from dialect het ‘heated, hot’, surviving in Scots and northern English dialect.
See the Oxford Advanced American Dictionary entry: het up