john: dave your mum has just died dave: fuk me! are you joking?  john: dave look at that girl over there dave: fuk me she is fit
meaning shock or to exaggerate something
"john: dave your mum has just died dave: fuk me! are you joking?  john: dave look at that girl over there dave: fuk me she is fit" What is the definition of "fuk me!"?