The bronx cheer is obviously a jeer. But the etymology is hard to trace.
I found a synonym for "jeer" I never heard of before:


gird 2
n., vi., vt.
5ME girden, to strike, assail with words < ? OE *gyrdan for *gierdan, lit., to rod < gierd, gerd, a rod (see YARD1): infl. by prec.6 gibe; scoff; jeer