Definition of in flagrante adverb from the Oxford Advanced Learner's Dictionary

 

in flagrante

 adverb
adverb
BrE BrE//ˌɪn fləˈɡrænti//
 
; NAmE NAmE//ˌɪn fləˈɡrænti//
 
(from Latin, literary or humorous)
 
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if somebody is found or caught in flagrante, they are discovered doing something that they should not be doing, especially having sex
See the Oxford Advanced American Dictionary entry: in flagrante