WordNet sense 1 (worthless material that is to be disposed of):

rubbish, scrap

WordNet sense 2 (worthless people):

scum

WordNet sense 3 (nonsensical talk or writing):

applesauce, tripe, trumpery, codswallop, folderol, wish-wash

WordNet sense 4 (an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant):

chalk, crank, glass, ice, methamphetamine, chicken feed, deoxyephedrine, meth, Methedrine, shabu, methamphetamine hydrochloride

WordNet sense 5 (dispose of (something useless or old)):

junk

WordNet sense 6 (express a totally negative opinion of):

pan, tear apart