Spankline

noun A euphemism for a phone-sex number; a number which can be reached via telephone in order to engage someone, usually a female, in sexual verbal conversation. Made famous by Sammy Hagar on the Van Halen song “Spanked.”

“All you bad, bad boys…call her up on the spankline!”
“Man, I blew a hole in my wall from the load I pumped out while on the spankline!”