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Old English sucan, from PIE root *sug-/*suk- of imitative origin (cf. Old Saxon, Old High German sugan, Old Norse suga, Middle Dutch sughen, Dutch zuigen, German saugen "to suck;" Latin sugere "to suck," succus "juice, sap;" Old Irish sugim, Welsh sugno "to suck"). Meaning "do fellatio" is first recorded 1928. Slang sense of "be contemptible" first attested 1971 (the underlying notion is of fellatio). Related: Sucked; sucking. Suck eggs is from 1906. Suck hind tit "be inferior" is American English slang first recorded 1940.
To be in a disadvantageous situation; get the worst and least of things: The plum assignments are there. The press coverage is there. We're up here sucking hind tit
[late 1930s+; fr the presumed disadvantage of a suckling at the nethermost teat]
for forming adjectives Inferior to or imitative of what is indicated: sub–Woody Allen (1963+)
drawing of fluids into the mouth by creating a vacuum pressure in the oral cavity. Mammalian infants rely on this method of food ingestion until they are capable of eating more solid substances. A partial vacuum is created in the oral cavity by retracting the tongue to the back of the mouth. The rear portion of the tongue seals against the roof of the mouth, allowing liquids to be drawn into the front region. When the oral cavity is full, the tongue relaxes, and fluids flow back to the throat to be swallowed.