The Scouse vindaloo is a term used for when you and the bird come home after a night out. Instead of ordering a curry & tailing the shit out of her, you shit in her face (the curry) smother it around like a face mask and leave it to solidify for 10 to 15 minutes. After that it’s optional what you do with it.
It could be used as a code that nobody understands for example Instead or asking to leave a party early to shag the wife you say
“Oi peng ting, Scouse vindaloo?”