If you're not familiar with them, a "Tom Swifty" is a punny sentence that involves a quote by a person named Tom which is the setup for landing a pun in the description of the quote's delivery (often but not necessarily a single adverb).
"This water is freezing," Tom said icily.
"I'm going to hit this piñata as hard as I can!" said Tom, bashfully.
"Nevermore," Tom said ravenously.
"I like tart fruits," said Tom with aplomb.
Really good Tom Swifties are often not immediately obvious, have a fantastic setup, or are simply really clever (mine are alright, though it's certainly possible to do far better).
You can get a more full picture and better examples from Wikipedia, but I encourage you to tread lightly there and in searches because it's way more fun to think of them and share them in threads like these than it is to pull up lists of them online. Just reading previously written ones kind of spoils the fun, IMO.
Anyway, let's see what great Tom Swities we can write!