and this is his weapon they weigh 150 kilos and fires 200 dollar custom tool cartridges at 10,000 rounds per minute, it cost 400,000 dollars to fire that weapon for 12 seconds
Refers to a pair of girls, where one of them is thin (yet of marginal looks), while the other is a fat girl. The thinner, uglier girl pairs up with the fatter girl in order to make herself look better (that is, in the eyes of potential suitors). A reference to the classic comic duo of Laurel & Hardy, where there is a thin person (Laurel), while the other (Hardy) is bigger (in this case, owing to the heavier girth, it is corrupted to Hearty- like a hearty appetite).
(Roger and Dave, looking at two girls on the street, resembling the aforementioned above)
Roger: Hey, Dave. Look at those two girls. The skinny girl is kind of ugly. What is she doing hanging around with the fat girl?
Dave: Don't you know? It's a classic case of a Laurel & Hearty. Can't you see that the thin ugly girl is using the fat girl to make herself look better?