vinegar strokes 

A method of swimming; you have front crawl, back crawl, breasts stroke, butterfly stroke and vinegar stroke. You prepell yourself through the water by girating your hips like your giving it to a woman.
You can prepell yourself backward using the same method...just by doing it on your back.

"and now for the 50 metres vinegar stroke final"

vinegar strokes by WouthoR March 25, 2003

Vinegar Strokes 

Manual clitoral masturbation of a females vagina.

Tarquin realised his luck was in when as soon as he was behind closed doors with Matilda, she had dropped her trolleys and it wasn't long before he was building up the vinegar strokes.

Vinegar Strokes by Bollockhead October 17, 2008