What is Dummo?
1.
a word for a dumb person or a person exhibiting dumb behaviour.
can also be used to refer to something not to your taste.
a person that is stupid, silly, dumb, lame, thick, clueless, dummo.
"..he is such a dummo how he thinks he's cool but he's not, he's just a big dummo.."
See
2.
noun. a presentation given to an individual, or group of people, of a lower than average intelligence (ie. dummies)
This will most likely be of a matter that common sense would usually regulate.
I have to give a dummo on proper phone usage in the office.
