Paper Planes (remix) Unknown Lil Wayne

a package on the way you know my whip game proper

A "package" is urban slang for a delivery of drugs. His "whip game proper" means that he knows to use inconspicuous cars at legal speeds to not alert the attention of authorities when delivering said drugs via automobile.
'package' is probably referring to drugs aka packs - 'my whip game proper' = i have nice cars