–tacular suffix in the forming of nouns, ‘an exciting or extravagant event’ associated with the root; in the forming of adjectives, an intensifier of the root, ‘a lot, great, large, extravagant, excessive.’ Editorial Note: Terms created with –tacular tend to be jocular one-offs, though some, like spooktacular and craptacular, appear to have more endurance. Etymological Note: From a resegmenting of spectacular, in which the syllable tacular splinters off of spec and becomes a combining form. This true segmenting of the word would ordinarily be spectacul, from the Latin spectacul-um ‘a show, spectacle, something worth observing’ and the Latin suffix –ar ‘of a kind; belonging to.’ (source: Double-Tongued Dictionary)
Further reading
Language is always evolving, and that’s also true for American Sign Language. A century ago, the sign for “telephone” was one fist below your mouth and the other at your ear, as if you’re holding an old-fashioned candlestick...
When a teenager went a week without talking as part of a school project, he noticed a surprising side effect: Instead of rehearsing a response to what other people were saying to him, he was focused on listening — and feeling smarter as a result...
Cf. the suffix <-tastic>, which often attaches to the same roots as <-tacular> for forming adjectives. (“Craptastic” and “craptacular” each return more than 50,000 Google-hits.)