Top Definition
An attempt of a moustache grown by a Birko that just has no strength in it whatsoever, usually just wisps of pubic hair grown above the top lip and a far cry from that of Magnum (Tom Selleck)
" I went on a bender and woke up three days later with what looked like a Birkenhead Mouser, I instantly shaved it off before leaving the house "
by John Gaskell September 17, 2005
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