Jolly Roger: the traditional flag used on European and American pirate ships; often pictured as a white skull and crossbones on a black field; the blackjack.
argh: what a pirate says to express annoyance, dismay, embarrassment or frustration.
Jolly R-argh-ers!: what a pirate says to express annoyance, dismay, embarrassment or frustration about Jolly Rogers.
"Jolly R-argh-ers!" - says a pirate