By far too lazy to liu today, what, pray tell, dear Dr. Bill, is a tam?

We've had favorite word threads here over the many 2.5 years of AWAD, and, surprisingly enough, I don't believe tam-o'-shanter has been included. Too bad. It should have been. Along with bellyouth's chawbacon! Somehow those two words in close proximity--Tam-O'-Shanter Chawbacon--jar, don't they?

Beauteous regards,
Word-o'-Wonderer