This term refers to those Canadian women who sojourn in Southern Florida, losing their bikini tops and inhibitions along the way for the duration.
Since she was so far away from Hamilton, Françoise indulged in a few mai tais and joined the ranks of the topless snowbirds. She mused, "Maybe a little fling with one of the cute guys by the pool." Florida is a nice place where what happens in Florida, stays in Florida. No back-home consequences!