"Just messing around with your friends, having a good time. Just as the 🅱️ emoji goes it can refer to 'foolin' or 'boolin' both are practicly the same meaning but 'boiling' is used by the Bloods.
Person 1: 'What are you doing tonight?'
Person 2: 'You know, probably 🅱️oolin with my homes'" -Urban Dictionary: 🅱️oolin