To inflict oral sex on a partner voraciously. A partner, for a
normal blowjob, will go up and down, but when your partner "swings that neck", it involves a wide range of
motion for suckage to occur.
example: a fast, almost violent, circular or triangular
motion.
Swing That Neck: a vicious,
fast, and
movement filled blowjob, where the partner sucking will go ape shit on the dick.
"She didn't just suck it
man, she swung that neck. It was crazy. "