Kind of a tough nut to tease out

This was overheard in a work conversation.  It is a mashup of “a tough nut to crack” (a problem that is challenging to solve) and “tease out (something)” (to unravel or separate out something).  The two idioms fused together indicate something that is hard to solve.  A big thanks to Amanda Zsuzsics for hearing this one and sending it in to my facebook page, Malaphors.