using going to the restroom as an excuse to escape from an undesired situation
Definitions (粵典–words.hk)
語句
藉口去廁所而逃走 using the excuse of having to defecate in order to escape
個差佬咁蠢㗎,畀個疑犯借屎遁走甩咗!
个差佬咁蠢㗎,畀个疑犯借屎遁走甩咗!
go3 caai1 lou2 gam3 ceon2 gaa3, bei2 go3 ji4 faan2 ze3 si2 deon6 zau2 lat1 zo2! Such a stupid policeman! The suspect used the excuse that he had to use the toilet and got away.