From WordNet (r) 2.0 (August 2003) [wn]:
hatful
n 1: (often followed by `of') a large number or amount or extent;
"a batch of letters"; "a deal of trouble"; "a lot of
money"; "he made a mint on the stock market"; "it must
have cost plenty" [syn: batch, deal, flock, {good
deal}, great deal, heap, lot, mass, mess,
mickle, mint, muckle, peck, pile, plenty,
pot, quite a little, raft, sight, slew,
spate, stack, tidy sum, wad, whole lot, {whole
slew}]
2: as many or as much as a hat will hold