I feel like we (Americans) are taught these stereotypes to prevent us from relating, and breaking away from the indoctrination Republicans have worked so hard on
Jesus Christ, it comes from cartoons dude. That's not something you were taught maliciously it's just a sound somebody thought was funny 40 years ago. Not everything is a conspiracy against you.
It's part of the "Maurice Chevalier funny French accent." Usually with a sexual innuendo.
He doesn't laugh honhonhon in this clip, but you get the rest of it: