Question

What does bertie mean when he calls himself a chappie

Answer 1

Chappie or chap, according to Google dictionary, is becoming cracked. Bertie mean when he call himself a chapie is in letter D. That he is a a sickly person.
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Answer 2

Bertie mean when he call himself a chapie is in  That he is a a sickly person. I hope you are satisfied with my answer and feel free to ask for more clarification and further question about your question. Have a nice day.