Here are some ways to understand "waggish":
* Similar to: jocular, whimsical, witty, roguish, impish
* Example: "The actor gave a waggish wink to the audience before delivering his final line."
* Opposite of: serious, somber, humorless, straightforward
Essentially, someone who is "waggish" is someone who likes to make others laugh with a bit of playful mischief.