Poppa Wheelie's is a biker bar that Homer got thrown out of three times.
NRBQ were playing there. Homer went there when looking for Marge after the Hell's Satans kidnapped her. He disrupted things by smashing a glass, thus getting beaten up and thrown out. He later returned to steal a beer keg in revenge. The name is a play on the term "Pop a Wheelie" which means to do a Wheelie, in which the driver lifts the front wheel (or wheelies in the case of cars) in the air and drives on the back one.
A bartender from the bar attended a meeting Moe set up with other bartenders when drinking in their bars was down.