In general sense, this implies a person that looks for analsex when he/she is out drinking/partying. When a 'lomsdal' has had a lot to drink he will switch to 'auto-butt-pilot' and aim in for the kill on the nearest butt.
'lomsdal' can be assosiated with the norwegian words: 'skinkerytter', 'lindsay', 'to i stinkern, en i pinkern', 'småplaya' and 'skitten snurrebass'.
A 'lomsdal' typically involves 'håndjern&avstraffelse på et toalett i finland' as yearly activities.
Man my auto-lomsal was on last night!