Final answer:
Spizzerinctum and ginchy are two examples of defunct American slang words meaning high spirits and excellent, respectively.
Step-by-step explanation:
Spizzerinctum and ginchy are indeed two examples of defunct American slang words. Spizzerinctum refers to high spirits or nerve, while ginchy means excellent. Both of these words were commonly used in the past but have fallen out of use in modern language.
Spizzerinctum, with its energetic connotation, was frequently used in the early 20th century. On the other hand, ginchy was a popular slang term in the 1950s and 1960s, often used to describe something impressive or cool. While these words may not be widely recognized today, they offer a glimpse into the ever-changing nature of language and slang.