in flagrante delicto
/ɪn fləˌɡranteɪ dɪˈlɪktəʊ
/(also informal in flagrante)
adverb
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...
- The photo at left is me, in flagrante delicto.
- Peter is so convincing that even if he were caught in flagrante he would have a perfectly plausible explanation.
Origin
Latin, 'in the heat of the crime' (literally 'in blazing crime').