aw thats cute... what are the others??
well, they're all kinda inside jokes, but i'll explain:
flyboy: my bro-in-law is a pilot
milkman: other bro-in-law once made the mistake of telling my sister that he drank milk for a week & thought his pecs looked bigger
big sam: father of...
milkshake: also named sam, but was given the nickname because he danced to this at his frat talent show
billy ray: DF's bro-in-law's nickname
vodkaredbull: DF's best mate knows no other beverage