Said by a guy to a woman, 'some' referring to loving or specifically to pussy. Spoken emphasis is everything, the emphasis being on 'some', not 'gimme'. This expression goes back at least to the early Fifties, which was when I first heard it.
Some of the gestures described in two other definitions of this phrase can also be interpreted as sexual.
Oh, baby, you lookin' hot tonight. Gimme some!
To mess up someone's thinking with illogical or distorted arguments, sometimes with a deliberate malicious intent, sometimes just out of misguided ignorance.
Trump's rhetoric is political headfuck.