Definition of in flagrante adverb from the Oxford Advanced American Dictionary

 

in flagrante

 adverb
adverb
NAmE//ˌɪn fləˈɡrɑnti//
 
(also in flagrante delicto
NAmE//ˌɪn fləˌɡrɑnti dəˈlɪktoʊ//
 
)
(from Latin)(literary or humorous)
 
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if someone is found or caught in flagrante, they are discovered doing something that they should not be doing, especially having sex
See the Oxford Advanced Learner's Dictionary entry: in flagrante