An arbitrary unit of measurement most commontly used to describe something extremely heavy in weight. It is also commonly used as a noun to describe Walmart shoppers.
"Dude that elephant at the zoo was freaking huge!"
"Yea man, he must have weighed at least half a ramiri."
"I just ate 5 quesadillas. I feel like I gained 2 whole ramiri."
"I got super baked last night and went to Walmart to buy some ice cream, and even though it was 2 am there were still so many ramiri in there!"