purlicue
The space between one's forefinger and thumb.
Evangelo's. I slid my tongue along the ridge of flesh that forms the purlicue, that bridge that connects thumb to forefinger, to make it receptive for salt.
Last night I licked a man's hand in
Where it comes from
Unclear. Some sources connect it to French pour la queue, from English pirl, purl (“whirl, twirl”).
Adapted from the Wiktionary entry purlicue (CC BY-SA 4.0).