People sometimes say Bubba Squish to mock other people, such as "He's such a Bubba Squish."
Never call a girl a Bubba squish.
In general, Bubba Squish is used to fill in awkward conversations, or you just don't know what to say..
Stranger 2 " Yeah. That kid is really awkward."
"Who is that?"
"wtf, What does that mean?"
"It's used for awkward people with awkward sayings."
Kid: "Hey, who are you going to the dance with?"
Girl: "Bubba Squish"