A winsome is when you are having sex with two or more other people and you are the ugliest person in the group. Therefore, the people you get to have sex with are the hottest ones in the group.
Person #1: I had a great winsome last night with Deb and Vi!
Person #2: But they're way out of your league.
Person #1: Doesn't matter, I still won!
Plain and simple: an anemometer.
An anemometer is an instrument used for measuring wind speed.
Winds were clocked with my stupid sodding "rotten catpeeyellow" portable digital "windometer" (as JD from JD Quad in the UK calls them even though those things are actually called, "anemometers") ;-) as being variable to 3.60mph (4.36kph) at the surface.