Swig Head
Someone who refuses to give away a sip of their beverage when the person asking is in dire need.
Person 1: "Hey dude can I have a swig of that Dr Pepper? The dry mouth is unreal!
Person 2: No mate.
Person 1: For fucks sake man, don't be a swig head!
Person 2: No mate.
Person 1: For fucks sake man, don't be a swig head!