Doc / Brauluver,
For what its worth:
A "Radler" is a 50/50 mix of standard lager beer (typicaly helles) and lemonade.
A "Russ'" (short for Russ'en, English Russian) is a 50/50 mix of wheatbeer and lemonade
A "Neger" (or "nigger") is a 50/50 mix of wheatbeer and cola
As to why, on a hot day you...