IF SLANG IS A REFLECTION OF THE quality of life of its speakers, then it looks like adolescence can politely be called Down Time. Let's not talk about all the teen-age euphemisms for alcohol or drug abuse; it's too frightening. Let's just focus on the words teen-agers use to describe mental and verbal abuse -- expressions for the day-to-day acts of rejection, ostracism, intimidation and total humiliation.

Consider these recent offerings: cold-dis v. To leave someone out, as in "Why did you cold-dis me at the party and leave without me?" (Keith Moody, Herndon). crack on v. To ridicule, to make fun of, as in "Mary cracked on Jane's bright yellow dress by saying 'Girl, take those batteries out of that dress' " (Paula Kenney, Warrenton). fizz adj. Stupid, completely backward, as in "You mean you let Johnny hang up the phone on you even after you two broke up?" "Yes." "That is so fizz" (Iris Denson, Washington). flag v. To fail, especially a test, as in "I just know I flagged my geology exam" (Dawn Lucci, Williamsburg). hark v. To steal, as in "He just harked my sandwich" (Debbie Tripp, Burke). negged adj. Rejected, turned down, as in "I was negged from Princeton but accepted at Yale" (Gale Cordell, Vienna). slummin' adj. Boring, bumming or generally negative, as in "It was a pretty slummin' class" (Joseph Rhinewine, Bethesda). Linguistic observers are invited to send examples of teen-age slang to: J Street, The Washington Post Magazine, 1150 15th St. NW, Washington, D.C. 20071.