Mac-thing - meaning and definition. What is Mac-thing
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Online Dictionary

What (who) is Mac-thing - definition

FICTIONAL CHARACTER IN THE ADDAMS FAMILY
Thing (Addams Family); Thing T. Thing

Mac-thing      
The word that a PC Wintel-using HTML programming geek uses to try and disguise his sloppy non-cross-platform programming skills. Usually said with an air of indignance.
Um, well, no - that table won't look right to you - it's a Mac-thing. Now, if you look at it on my PC...
MAC         
LIST OF THINGS CALLED MAC
Mac (character); MAC (disambiguation); MAC; Mac (disambiguation); .MAC; MaC; M.A.C.; M.A.C; The Mac; Mac (name)
Media Access Control (Reference: ISO, OSI, LAN, , WLAN, ...)
Mac         
LIST OF THINGS CALLED MAC
Mac (character); MAC (disambiguation); MAC; Mac (disambiguation); .MAC; MaC; M.A.C.; M.A.C; The Mac; Mac (name)
·- A prefix, in names of Scotch origin, signifying son.

Wikipedia

Thing (The Addams Family)

Thing T. Thing, often referred to as just Thing, is a fictional character in The Addams Family series. The Addamses called it "Thing" because it was something that could not be identified. It is known as "Cosa" (Thing) in Spain, "Dedos" (Fingers) in Hispanic America, "Mano" (Hand) in Italy ,"La Chose" (the Thing) in French speaking countries, and "eiskaltes Händchen" (icecold hand) in German.