dickin sandwich first came to life in Kildare, Ireland when a man driving a white van, saw a beautiful lady and turned to his work colleague and stated. "She'd get a dickin sandwich". He was referring to putting his penis in her mouth. (in Ireland where "mickey" is the slang word for a penis, dickin sandwich may also be known as a mickey sandwich)
"That girl looks hungry for a dickin Sandwich, i'd say she's suck a golf ball through a garden hose"