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Meaning "shall you take heed?". Used commonly in the UK, particularly amongst the younger generation. Can also be an exclamation of excitment or pleasure. Linked with shal'moon, t'ozzzz be fair and t'ozzzz be moon.
John: Let's go clubbing! Shal'heed?
Roger: OK

John: I've just puchased a large bottle of vodka.
Roger: Shal'heed!
by xaudust October 02, 2006