(Ken: Each response is two 3-letter words.)
The Pleistocene glacial epoch is also known as the great this
Ice age
With nearly 30-inch legs, IKEA's Yngvar is this type of seat that's perfect for throwing back some cold ones
Bar stool
The CDC describes it as "a temporary sleep problem that usually occurs when you travel across more than three time zones"
Jet lag
The dried chilies in this spicy Szechwan chicken dish might have a little too much "pao" for some
Kung poa chicken
A killer for hire, like TV's Barry Berkman
Hit man
As a verb, it means to move busily; as a noun, it was an 1880s piece of undergarment that held out the back of a skirt
Bustle
Beastly term for someone who religiously works out at, let's say, Planet Fitness
Gym rat
To wear, it's a comfy piece of around-the-house footwear; to sit on, it's a short-legged, armless chair
Slipper
This Scottish outlaw spent time in Newgate Prison but was pardoned before he was to be sent to Barbados
Rob Roy
Use a pound of the Bing variety & don't set yourself on fire when you ignite the liquor in this 2-word dessert
Cherries Jubilee