from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a coarse, uncouth, uncivilized fellow, perhaps violent
from the GNU version of the Collaborative International Dictionary of English
- n. A rude or clownish person; boor; lout.
from The Century Dictionary and Cyclopedia
- n. A coarse, ill-bred fellow; a rude lout; a boor.
Sorry, no etymologies found.
Tums is a grobian, therefore he is the one with the severe brain impairment.