Cross between a squeal (of glee) and a tingle (due to encountered hotness) and possibly involving connotations of tinkle ('cause you're so excited that you sorta pee yourself a bit). Much like "squeal" and "tingle," skwinkle can be used as either a verb or a noun.
To take something small, that doesn't quite qualify as a theft. Probably from the Danish "skæv" or the Dutch "scheef", both of which are pronounced similarly, meaning "askew, or not quite right'. To change an item's ownership without permission, but only something small and of little worth.
"I skeefed an apple off the neighbor's tree." "I skeefed some chips outta your bag when you looked away." "Don't skeef my chair when I go to the bathroom."