in flagrante delicto
adverb
[ ɪn fləˌɡranteɪ dɪˈlɪktəʊ ]
• in the very act of wrongdoing, especially in an act of sexual misconduct.
• "he had been caught in flagrante with the wife of the Association's Treasurer"
Origin:
Latin, ‘in the heat of the crime’ (literally ‘in blazing crime’).
