A person or thing that is Really big, beyond collosal, massive and large.
"Did you see that girl/boy they wer chubbonk cud they get much bigger"
"that is one chubbonk pile of dog @*!%"
"Did you see it when they bent over there A!%@ was so chubbonk they blocked the sun!"
occurs when two gay men chubby hug each other.
Todd: Hey Brett, what's up? Nice to see you!"
Brett: Todd! Oooh, from the chubby hug I can tell the feeling is mutual!
Todd: Chubbonk baby!