「Meat with viciousness, ferocity」refers to the toughness and perseverance of a BADGER, as well as the tastiness of its meat, widely consumed in the past all over the world and renowned as a delicacy.
　A BADGER or other animal such as a human being with shortened legs,「chewing, gnawing while sucking」means UNRELENTING CLENCHING:「Badger…lower jaws are articulated to the upper by means of transverse condyles firmly locked into long cavities of the skull, so dislocation of the jaw is all but impossible. This enables the badgers to maintain their hold with the utmost tenacity…」
　　[　https://en.wikipedia.org/wiki/Badger 2013-01-14　]　
　Note the right element of「sucking and chewing」is synonymous with「chewing while fellating.」A badger with clenched jaws around some living meat would likely be sucking up most of the juices and blood while awaiting the death of its victim, not unlike a clenching, vengeful service provider.
　CLENCHING and related problems and fears are present in these glyphs:
　歯 and 齒 as teeth.
　恨 regret, hate, resentment, rueful, hold a grudge, malice, bitter feeling, rancor, to curse and swear.
　艮 chewing.
　仡 being fed up with conditions and bravely doing something about it while unafraid of the consequences.
　旡 suddenly choking on something in one's throat.
　兂 clasped with teeth.
　邪 wickedly demonic.
　拑 pinning with clenched teeth.
　音 loud noise.
　既 and 既 too late, happened already, unchangeable.
　茱 and 萸 bloody stump, dogwood.
　飢 ravenously chomping meat.
　啗 enticing lure, gnawing meat.
　啖 threaten a superior, taunt and torment, reckless endangerment while tasting and eating.
　猖 ferocious and insane, mad, reckless, not following the rules.
　惕 healthy respect of danger.
　𣇄 and 晣 biting off a chunk, bent by tonguing mouth.
　惮 and 憚 fear, dread, shirking, shrunk.
　喫 clenching with gasps.
　吃 and 喫 extirpate, destroy utterly.
　揕 bare-fisted jab, punch in the face.
　意 long in thought, intent, concerns.
　貇 tenaciously clenching jaw and not letting go.
　虞 horror, terror, terrorism.
　鉗 clamp and gag.
　𪗱 and 齟 discord, broken teeth.
　𪘚 and 齬 gritting one's teeth, great hatred.
　齭 pain caused by teeth.

Modern definitions (that generally disregard history) …excluding politically incorrect concepts and other meanings deemed offensive today; may list only pigeonholed definitions, euphemisms, or meaningless mnemonics)
Unihan extended: to root, gnaw