An angry Bengali letter? Chitti-chitti Bong! Bong
A talkative Bengali? Bulbul Chatterjee
An outlawed Bengali? Kanoon Banerjee
An enlightened Bengali? Jyoti Basu
A stupid Bengali girl? Balika Buddhu
A Bengali marriage? Bedding
A Bengali voyeur? Keyhollo
A mad Bengali? In Sen (insane)
A dark Bengali who lives in a cave? Kalidas Guha
A perfumed Bengali? Chandan Dass
A Bengali goldsmith? Shonar Bongla
What's bigger than the Bay of Bengal? The Bengali Ego
When does a Bengali sound like a dog? When he says Bow (wow)
Also when he bharks! (works).