"Throughout our society there tends to be one informal or backstage language of behaviour, and another language of behaviour for occasions when a performance is being presented. The backstage language consists of reciprocal first–naming, co–operative decision–making, profanity, open sexual remarks, elaborate griping, smoking, rough informal dress, ' sloppy' sitting and standing posture, use of dialect or sub–standard speech, mumbling and shouting, playful aggressivity and 'kidding,' inconsiderateness for the other in minor but potentially symbolic acts, minor physical self–involvements such as humming, whistling, chewing, nibbling, belching, and flatulence. The frontstage behaviour language can be taken as the absence (and in some sense the opposite) of this. In general, then, backstage conduct is one which allows minor acts which might easily be taken as symbolic of intimacy and disrespect for others present and for the region, while front region conduct is one which disallows such potentially offensive behaviour." 
(Erving Goffman, 1959, p.78)
 It may be noted that backstage behaviour has what psychologists might call a 'regressive' character. The question, of course, is whether a backstage gives individuals an opportunity to regress or whether regression, in the clinical sense, is backstage conduct invoked on inappropriate occasions for motives that are not socially approved.
Goffman, E. (1959). "The Presentation of Self in Everyday Life", University of Edinburgh Social Sciences Research Centre.