high ‧ fa ‧ lu ‧ tin /ˌhaɪfəˈluːtən◂, ˌhaɪfəˈluːtɪn◂ $ -tn◂/ BrE AmE adjective informal
[ Date: 1800-1900 ; Origin: high + falutin , perhaps from fluting 'making a high sound (as if) on the flute' ]
highfalutin language or behaviour seems silly although it is intended to be impressive – used to show disapproval