Fictive kin is a word that social worker types use to identify someone that is like a uncle, brother, or grandmother to you, but is actually not related to you by birth or marriage.
**Kickshaw **- a small, exotic and elaborate delicacy, especially one where the ingredients are transformed beyond recognition by the preparation.
Wanktard.
I heard it on Bones.
At the risk of confirming my one-trick pony status, the coolest word I’ve learned lately is sanctimommy. 
Are you going to leave us to make up our own minds about what those words mean?
I’m sure they were going to post a follow-up just as you were typing that.
Should be finished sometime in the next decade-and-a-half…
Exegisis refers to drawing meaning from a text (usually scriptural). For example, today’s Bible lesson is Luke 10:25-37, the parable of the Good Samaritan. If we apply some exegisis to the text, we come to understand that a) the Jews detested the Samaritans, and b) the “Rich Young Ruler” that Jesus speaks of asked Jesus to summarize The Commandments, and Jesus said, “Love your neighbor as yourself.” c) The Rich Young Ruler then asked, “Who is my neighbor?” d) When Jesus finished the parable, he asked who was the neighbor to the injured party in the story. e) The RRR responds “the one who did him a kindness” and not “The Samaritan.” f) Ergo, the RRR wasn’t looking for an example, he was looking for an exception. g) Everyone, even if you hate them or they hate you, is your neighbor and deserves your love, according to Jesus’ teaching.
Eisegisis is … the opposite of that. I guess it would be bringing your own meaning to a text rather than examining it in context. Or something.
… Actually, I was inordinately proud of that line. “Guess” isn’t exactly right, but it’s a meta joke …
sigh.
Tegular. “a specific edge detail on ceiling tiles, designed to create a stepped or angled drop below the grid, enhancing the visual appearance of the ceiling and minimizing the visibility of the grid system.”
Nychthemeron
“a period of 24 consecutive hours. It is sometimes used, especially in technical literature, to avoid the ambiguity inherent in the term day”
Atelier.
“A workshop or studio, especially one used by an artist or designer.”
I encountered it in the game Blue Prince. Since my nickname is Rat, I have decided I’m going to call my writing shed “The Ratelier.” 
Fettle (noun)
Condition, as in, “the aircraft is in fine fettle.”
However, in The Ballad of Buster Scruggs, Buster asks for a drink to “keep my singing voice in fettle.” Which doesn’t fully fit with the “textbook (viz, Google)” definition, since by-the-book “fettle” just means “condition,” not necessarily “good condition.”
It’s also a verb - I know it in a machining context where it basically means to fine-tune the fit of parts by filing and polishing, but it has a broader meaning in crafts of trimming and finishing, especially seams or mold lines, as well as a different specific meaning in metal foundries.
Also used more generally/metaphorically in the north of England for setting something up, organising or tidying something.