–tacular suffix in the forming of nouns, βan exciting or extravagant eventβ associated with the root; in the forming of adjectives, an intensifier of the root, βa lot, great, large, extravagant, excessive.β 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 βa show, spectacle, something worth observingβ and the Latin suffix –ar βof a kind; belonging to.β (source: Double-Tongued Dictionary)
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.)