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This Kiwi (New Zealand, typically with farmers, labourers and military) slang phrase is heard in expressions like "don’t bust your foo-foo valve", or "if you do that you’ll blow your foo-foo valve", when someone is trying to lift a weight or do a heavy physical task which might cause physical strain. It is used about both sexes. It has been mentioned that the "foo-foo valve" is the anal sphincter, so that foo-foo would perhaps be onomatopoeic for fart. Generally it is thought to refer to avoiding a hernia, a prolapse, or vomiting while under great strain and/or exertion.
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