I suspect not a single person on the planet can claim they have not acted out both definitions of this word.
dalliance (dal·li·ance): / DAL yuhns /
noun
(1) flirtation; flirtatious episode or affair; amorous toying
(2) dawdling; trifling; frivolously or idly wasting time
[Coined from English dally + -ance.]
Usage: I sincerely hope my dalliance with writing grows into something more meaningful.