Phr.: to come up the Clyde on a banana boat; variants to come up the Clyde on a bike, to come up the Clyde on a wheelbarrow, to come up the Clyde on a banana skin. Phrs. used, usu. in neg., as an indication of stupidity or naïvety (Bnff., Fif., Edb., Ayr., Dmf., Rxb. 2000s).

banana boat - used in an expression of disbelief when told a tall story or blatant untruth ("Dae ye think Ah came up the Clyde on a banana boat (?)")