Unfortunately, advertising and commercials make us believe that some grammatical forms are correct or acceptable these days. There is this one pizza commercial that drives me to desperation, because they say that they have the "most bestest" pizza in town. This couldn't be any more incorrect, yet it is used in a TV commercial. It is appalling! Hence, "the most wildest" is equally incorrect. Of course, you can use this as a joke, but it is NOT grammatically correct! Comparatives and superlatives may not be mixed!
Words like "better", "colder", or "wilder" are comparatives of short or monosyllabic words, and "more comfortable", "more expensive", or "more interesting" are comparatives of long or polysyllabic words. The corresponding superlatives are "the best", "the coldest", or "the wildest" for short or monosyllabic words, and "the most comfortable", "he most expensive", or "the most interesting" for long or polysyllabic words. Of course, there are also negative comparatives and superlatives, such as "less cold"/ "less expensive" and "the least cold"/ "the least expensive".
