1. To talk about something excessively that falls outside the scope of your culture, ethnicity, range of experience, socio-economic class, age, or location.
2. To bloviate about urban activites and/or 'hip' slang.
Even though he lived most of his life in the richest, whitest suburbs of California, John would spend much of his day merrilling about 'ghostriding on whips' and other hardcore 'rap activity'.