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Jaan Jaanke is when someone does something on purpose and knows exactly what they're doing, like a dirty old man who knows he's about to get caught.
I texted my ex 'I miss you' knowing she'd text me back instantly. Jaan Jaanke, buddy.
He tripped on purpose so he could laugh at me. Jaan Jaanke at its finest.
She told her mom she was going to the store, but she was really going to the mall. Classic Jaan Jaanke.