(re¯'bus) n., pl. -bus·es.
A representation of words in the form of pictures or symbols, often presented as a puzzle.
[From Latin re¯bus, ablative pl. of re¯s, thing.]
I should have this figured out by tomorrow...
UPDATE: Our team of experts has cracked the rebus. Hat+pea, then gnu, then y+ear... That all adds up to...
Hatpea Gnu Year!