I recall hearing these terms once or twice around the watering holes of Fliegerhorst, and other 'exotic locales'..
"Slick" : UH1H or earlier with only door mounted 60's for armament
"Bomb Box' and/or "Bomber Huey" : UH1H with M-56 mine delivery sub system
"Hog" / "Fat Mike" : Mike model gunship Huey... different cord and span on blades, ect.
"Disco Bird" , "High Slow & Stupid", "Electric Huey" : SOTAS Mission UH1H, retractable skids, ect.
"Snake" "Sea Snake" (never Cobra) AH series, Army (single eng.) & Corps respectively were "Snake Drivers"
"Sh*t Hook": Chinook also, "Big Windy" (local unit nick name)
"Greaser" : CH53 ...might have been local use only cause U needed a 55 g. drum of oil & hydrolic fluid and a hand pump to complete the missions
"Loach" OH6 scout, especially when working with a gun team
"Lady Bird" the early crew name for the first BH206 replacements (hated) for the Loach...word was that Lady Bird Johnson had stock in Bell Helicopters, and we paid for her war profits in blood... way underpowered, crash and burn became one word, lack of tail rotor authority, lack of survivability.. the list goes on... sorry, I digress.
There were more. Go do your homework now .
Rotorhead173