Wiktionary
melonheads
n. (plural of melonhead English)
Wikipedia
Melonheads
The Melonheads are a group of fans of the NFL's Los Angeles Rams that attend games with a carved out watermelon placed on their head. The group first started with five people in 1985 when they were called the Fearsome Fivesome. The group grew to about a dozen members. The founder of the Melonheads, Lance Goldberg, was inducted into the Pro Football Hall of Fame as part of the VISA Hall of Fans in 2000.