Home Slang - Informal & Colloquial English Vocabulary Vocabulary: Slang, Informal & Colloquial English (C1) - Lesson 3: Recognizing Shifts in Slang, Modern Usage & Online Lingo (Netiquette) Vocabulary: Slang, Informal & Colloquial English (C1) - Lesson 3: Recognizing Shifts in Slang, Modern Usage & Online Lingo (Netiquette)