similarly to how you'd say a guy is "getting head" during a
blowjob, the
girl would be "getting straw". you know how you
sip/suck on a straw? yea, it comes from that.
Girl A:
kyle gave me the best straw yesterday. i almost suffocated.
Boy B: damn, that must've been good head.
Girl A: well it was definitely good straw.