WordNet (r) 3.0 (2006):

hippy
    n 1: someone who rejects the established culture; advocates
         extreme liberalism in politics and lifestyle [syn:
         hippie, hippy, hipster, flower child]

Moby Thesaurus II by Grady Ward, 1.0:

49 Moby Thesaurus words for "hippy":
   adipose, beefy, big-bellied, bloated, blowzy, bosomy, brawny,
   burly, buxom, chubby, chunky, corpulent, distended, dumpy, fat,
   fattish, fleshy, full, gross, heavyset, hefty, imposing, lusty,
   meaty, obese, overweight, paunchy, plump, podgy, portly,
   potbellied, pudgy, puffy, pursy, roly-poly, rotund, square, squat,
   squatty, stalwart, stocky, stout, strapping, swollen, thick-bodied,
   thickset, top-heavy, tubby, well-fed