Often used by latinos and mexican-americans to describe something magnificently surprising . It is the combination of a Saint John (San Juan), which is used to describe something magnificent, and a Saint Peter (San Pedro), which is used to desbribe something surprising.
It is also used as a noun.
Juan Pedro is a XXI century, famous mexican paintor, reknowned for his collection of Indian nudes.
That tattoo you got of the Virgin Mary is a total San Juan Pedro.
He's such a San Juan Pedro.
We studied over 30 golden ratios used by Juan Pedro in his painting "The discovery of Lupita".