Aamader=our (with respect)
Kotha=katha=thing, story, anecdote, saying
Bolechhe=spake, err ... spoke, said.
As to what Hazrat Muhi-us-Sunnah (RA) said that will be told by our brothers from Bangladesh but a curious fact is the one that has precipitated this post. Twenty two percent of the caliphs of Shah Hardoi (RA) are from Bangladesh. Since most of them are either from or around Dhaka therefore it will make Dhaka a sort of the actual kingdom of the king, that is Shah, that was Muhi-us-Sunnah (RA).