The present study uses variationist sociolinguistic methods to examine the intensifier system in Oslo Norwegian. Results indicate that both linguistic and social factors influence intensifier use. Predicative adjectives were intensified more frequently than attributive adjectives, women used intensifiers more frequently than men, and younger speakers had higher intensification rates than older speakers. Apparent time analyses also reveal a change in progress toward the use of skikkelig ‘proper’, a change led predominantly by young women. Although veldig ‘very’ was the most frequently used intensifier, its use decreases in apparent time, whereas skikkelig increases in frequency among younger speakers. The development of the intensifier skikkelig appears to follow a common pathway of change from adjective to manner adjunct to degree adverb, as well as from appropriateness to intensification. Comparisons with work on English, German, and Norwegian reveal several crosslinguistic tendencies about the linguistic and social conditioning of intensifiers. This study provides the first variationist sociolinguistic analysis of intensifiers in Oslo Norwegian; it provides support for several crosslinguistic claims about intensifier use; and it contributes to the visibility of variationist sociolinguistic work in the study of Norwegian variation and change.