It is narrated from Sayyiduna al-Mughirah bin Shu'bah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) came to the rubbish heap of such-and-such a tribe, spread his legs apart and urinated standing.
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 18090