Nasha is a simple Hindi/ Urdu word which means intoxication, the state of feeling drunk as an effect of something.
Besides, any intoxicant also can be called nashaa in Hindi/ Urdu. And also, nasha karna becomes a verb, which means to have, consume an intoxicant. Nowadays drugging is also simply called 'nasha karna' sometimes, though nasha can generally include any type of intoxicant.