self-congratu·la·tion
noun/ˌself kənˌɡrætʃəˈleɪʃn/
/ˌself kənˌɡrætʃəˈleɪʃn/
[uncountable] (usually disapproving)- a way of behaving that shows that you think you have done something very well and are pleased with yourself
沾沾自喜；自鸣得意