to cheat / to swindle / to deceive / to get on (a horse etc) by swinging one leg over
骗
=
扁
+
马
:
Pocahontas (pi) promised the unicorn (马) to take it on a wild and natural wild water ride, but as she shows him her small boat (扁) in the flooded bathroom of the anthill (an4) the unicorn feels kind of cheated (骗).