Coloquialism for male genitalia (Penis), predominantly used in Scotland.
Recently used as a double-entendre
in a number of songs by Real Radio breakfast presenters Robin Galloway and Kat for example "I love ma boaby (on a Saturday night)" where Cecil's boaby is explained to be a small mouse
Used on a number of wind-up
s on the same show... e.g. I've stuck my boaby up my exhaust