Literally it means "to be among the heavily built people even though thin (and tiny)". It's a saying popularized by Soul Jah Love which means overcoming obstacles and achieving stardom in spite of stereotypes and bleak starting conditions.
Muchitiseka kuti tinorima nembongoro imi nematractors, kana nguva yekukohwa yasvika tinenge tiripo pamamonya ipapo imi mozoti idivisi.