he has cheated me twice (or tripped me up, or deceived me): Esau started to understand Jacob's true nature. Jacob took the birthright (the right of inheritance, Hebrew bekorah; 25:27–34). He tricked their father to get the blessing (the spoken pronouncement of the inheritance, Hebrew berakah).
Esau was right in how he judged Jacob, but he did not recognize his own ungodliness in these actions (see study note on 27:5; Hebrews 12:16).