Lyric discussion by pie21 

Cover art for Squirm lyrics by Dave Matthews Band

Yeah I was wondering the same thing cellordore. Turns out Dave explains it in his interview with Billboard a few months ago (http://tinyurl.com/cfv8vo), as well as the dog barking.

As for the actual words, with a hand from AntsMarching (http://tinyurl.com/q9vnmd), adding some words that I have no idea about (?) but that sound phonetically close. Maybe they're some kind of American food I'm not aware of? Anyway:

I have scalloped prawns (?) I have potato corn (?) Sweet potatoes, I've (?) potatos I have onion, I have garlic I have bell peppers I have green onion, tomato, cucumber, avocados I have onion and bananas (?)

Highlight of the album for sure :P

As iccredman explains below, this is a street vendor in New Orleans. He is credited on the album as 'Arthur Robison "Mr. Okra": Produce Vendor".