(Scottish) A penis.
2005, Liz Rettig, My Desperate Love Diary: by Kelly Ann, Corgi Books, UK, [http://books.google.com.au/books?id=Z5FR4bScT2YC&pg=SL5-PA102&lpg=SL5-PA102&dq=%22tadger%22|%22tadgers%22+-intitle:%22%22+-inauthor:%22%22&source=bl&ots=59uj_umu-…
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.