Where does the term 'That sucks!' and putting 'man' on the end of sentences come from? "aw that sucks, man!" Thanks!
The expression that sucks seems to be predominantly connected to the reduction of a colloquial expression for fellatio as it is metaphorically applied to any disgusting or contemptible situation:
Meaning "do fellatio" is first recorded 1928. Slang sense of "be contemptible" first attested 1971 (the underlying notion is of fellatio).
etymonline.com emphasis added
Two alternate expressions have related connotations of disgust and deficiency:
Suck eggs is from 1906. Suck hind tit "be inferior" is American English slang first recorded 1940.
Washing dishes after lasagna sucks [eggs].
Whoever comes in last place sucks [hind tit].
informal , chiefly North American
Used, irrespective of the sex of the person addressed, to express surprise, admiration, delight, etc., or for emphasis:
Man also was in Old English as an indefinite pronoun, "one, people, they." ... As an interjection of surprise or emphasis, first recorded c. 1400, but especially popular from early 20c.
Etymonline does not explain how to suck in "That sucks" got the meaning of enervating or very bad. But "That sucks" is mainly AmE. Urban Dictionary has something about the use of to suck in the American jazz scene. http://www.urbandictionary.com/define.php?term=Suck
But "That sucks" seems to have extended its use and to have developed a new meaning.
Edit: Urban Dictionary has a second entry "That sucks". Explains the usage and that the expression is considered a tabu word, but no etymological or semantic explanation. I think that the expression is a tabu word is not very serious and exaggerated prudery. I have the feeling it is a common slang expression used by a special generation.