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The little boy had a puckish grin on his face when he was caught with his hand in the cookie jar. Puckish means mischievous and is an adjective.
Puck is a mischievous fairy or elf. To be puckish is to be mischievous and "tricksy." Here are some sentences.
puckish
Flirtatious, frivolous, teasing, puckish, frolicsome and mischievous are a few.
There is no specific origin, in Old English the word 'puca' referred to a malicious fairy, or more specifically something like a demon