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It's a term to refer to someone you want to have sex with but you find annoying or does your head in.
'He is doing my head in he is such a shag ache'
by JlD82 September 20, 2016
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A term used for a man or woman who you want to have sex with but who you find annoying!
'He is doing my head in he is such a shag ache'
by JlD82 September 20, 2016
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Get a shag ache mug for your father-in-law Günter.