eavesbomber
Somebody who sneaks up on a chat and tries to join in with their stupid take, even though they have no idea what’s going on.
At the party, I was talking to my friend about the movie, and my uncle walked over and said, 'That movie is total garbage, I saw it in 1998.'
While I was telling my brother about my day, my mom showed up and said, 'You should’ve just stayed home.'
In the grocery store, I was talking to my friend about the best cereal, and this random guy said, 'I eat cereal with my dog every morning.'