What an odd and helpful product! And a #CutthroatCompound. THICK-IT (1987) is a beverage thickener for people with dysphagia. THICK was a transitive verb 1000 years ago but not so common this millennia.
Here are all my ITs. The orange dates could definitely be antedated. #CutthroatCompound product names started with Elmer's GLUE-ALL (1947), SHED-RAIN (1947), and XPEL AIR (1955), but really had a boom in the 1980s and have continued since (GAINSIGHT, ADDHAIR, SWAPCARD, FOLLOWFLIGHT, GIVEVISION, TRAKCEL, etc.)