According to one interpretation within Islam, high-fiving a girl is not permissible.
According to AHMAD, as mentioned in the reference, physical contact such as high-fives or hugs are permissible between individuals of the same gender, but "if it's a girl then you can't". This perspective stems from interpretations of Islamic teachings regarding interactions between men and women who are not closely related (mahram). These interpretations often emphasize avoiding physical contact to prevent potential temptation or inappropriate behavior.
