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.