So the be-hatted squat one is “Momma” (as that’s the name of the strip) and the fellow on the left is her son, Francis. I just looked that up on Wikipedia. Anyway, the foundation of a cool, modern maternal relationship is the procurement of beer. That’s the joke, presumably.
Two things bother me. One is the fact that they’re clearly outside, so the fridge can’t be anywhere nearby. The other is the phrase “cop me a beer.” I rarely encounter “cop me” followed by anything other than “a feel.” And since this is a son addressing his mother, I’m supremely creeped out by the whole thing.