Bhashya
बस्तिस्त्वेष आत्मनो वैश्वानरस्य, बस्तिः मूत्रसंग्रहस्थानम्, बस्तिस्ते व्यभेत्स्यत् भिन्नोऽभविष्यत् यन्मां नागमिष्य इति ॥
In plain words
This is indeed the bladder of the self Vvaiśvānara, the bladder being the receptacle for urine; your bladder would have burst and split apart if you had not come to me.
Close to the Sanskrit
This indeed is the bladder of the self Vvaiśvānara, the bladder is the place for gathering urine; your bladder would have burst, it would have been split, if you had not come to me.