Place this clip at the very end of a short edit as the final reaction, then follow it with a fart with reverb for the gross-out tag and finish on a bruh to let the other person respond.
About this sound
This is a 4-second Russian voice clip of a man flatly stating he is smearing his butt, spoken clearly with no music or effects behind it. The line is crude and completely unexpected, but the bored, matter-of-fact delivery makes it sound casual. That clash leaves listeners surprised and laughing in disbelief, like a punchline dropped with a straight face.