Green’s Dictionary of Slang

bitties, the n.

also bitty bam-bam

(W.I.) diarrhoea.

[UK]R. Antoni Grandmother’s Erotic Folktales 32: We saw a woman [...] that looked like she was suffering from a good case of bitty-bambam. [...] So I was thinking to tell Uncle Olly to stop for this poor woman as I felt so bad, but then again if she did have the bitties – or if she was too proud to use the bush and she was toting a load – then we didn’t want her in the back seat.