The word "嘻皮笑脸" is formed by combining four characters: "嘻" meaning to giggle or laugh lightly, "皮" implying cheekiness or superficiality, "笑" meaning to smile or laugh, and "脸" meaning face; together they depict a facial expression of frivolous or insincere grinning, where the characters sequentially describe the act of laughing and the facial demeanor to convey the concept of a smug, disrespectful smile.