MacDiverr - Any object that gets shoved up a friend’s butt just because

Any object that gets shoved up a friend’s butt just because you’re bored and you can.

I used a pen as a MacDiverr. It was tiny but it did the job.

I used my teacher’s ruler as a MacDiverr. He didn’t even notice until later.

I used my brother’s spatula as a MacDiverr. It was hot and it left a mark.