in flagrante delicto Hear it!

in flagrante delicto Definition

in fla·grante de·licto (in flə gran′tē dē lik′tō′)

adverb

  1. in the very act of committing the offense; red-handed
  2. while engaged in sexual activity, often, specif., illicit or perverse sexual activity

Etymology: L, lit., during the blazing of the crime