やり口くち

noun

way of doing; method; trick

Usually carries a negative connotation, implying a cunning, underhanded, or questionable way of doing something.

• 彼かれのやり口くちはいつもずるい。

  His way of doing things is always sneaky.

• 詐さ欺ぎ師しのやり口くちに引ひっかからないでください。

  Don't fall for a scammer's tricks.