Longtime readers may recall that back in the SCAF era, a Member of Parliament quoted a folk saying, "we let the donkey get away while holding on to the saddle" (نترك الحمار ونمسك بالبردعة). He was accused of calling Field Marshal al-Tantawi, Sisi's predecessor, a donkey, though he hadn't really done so exactly. (And the accusation got more publicity than the original quote, just as I imagine this photo would not have gone around the world if the man had not been arrested.)
Himar (donkey) is a standard insult in Egypt.
UPDATED: I just noted the donkey has a sidearm.