Expressions (phrases, clauses, etc.), Adverb (fukushi)
best regards; please remember me; please treat me favorably (favourably); please take care of
Slangpun on 宜しく; orig. used by young bike-riding delinquents; now oft. joc.see 宜しく
Also written 夜露四苦【よろしく】、夜呂死苦【よろしく】