Wallowing in animals is comfort behaviour during which an animal rolls about or lies mud, water or snow. Some definitions include rolling about in dust, however, in ethology this is usually referred to as dust bathing.

How do you wallow?

Wallow is the passive form of swallow. Being swallowed by the hollow, the pillow or anything else that's sink-in-able is what gives the feeling of wallowing. It's impossible to do a shallow wallow. You have to totally immerse yourself or it doesn't really count.

What does wallowing in sorrow mean?

devote oneself entirely to something; indulge in to an immoderate degree, usually with pleasure. "Wallow in luxury"; "wallow in your sorrows" wallow, welterverb. roll around, "pigs were wallowing in the mud"