Slang/slæŋ/ Definition 1 of 3Pro Tip 1/3Group Specific Slang varies between groups, often reflecting their shared experiences and values. Skaters have their own slang to describe tricky moves. Pro Tip 2/3Evolving Language Slang words can change meaning over time or fall out of use. The slang 'groovy' was popular in the '60s but is seldom used now. Pro Tip 3/3Not Universal What's slang in one region or country might not be understood in another. Australian slang can be confusing to English learners from other countries.