Only applies to non-living things. Something so awesome, no other words can describe it. The epitome of greatness. The Holy Grail of all things amazing. The ultimate compliment to an inanimate object. Even higher in the ranks than "the tits". Considered divine in nature because of the sheer intensity with which its magnificence radiates outward.
1) Keith, this danish is so good. It's god's beard, man! Nice job!
2) Kathryn, where on EARTH did you find this tennis racket?! It's so light, yet so sturdy and easy to use. I think it might just be god's beard!
3) Billy is a saxaphone player beyond natural human abilities. I think his saxaphone is god's beard. It must be if a player of his caliber has graced it with his lips.