This study investigates the way some speakers of Bukavu Swahili in Bukavu transform the message due to a mispronunciation of some words during communication. The present study aims at understanding, how, why and when some word meanings are deviated by these speakers. The mispronunciation of some words in Bukavu Swahili creates a deviation of their meanings. This is done due to the fact that by mispronouncing a word, a different word is born which puts the listener into confusion. Thence a different message is conveyed contrary to what the speaker wanted to give. During this investigation, we noticed that deviations in Bukavu Swahili can be analysed through two different factors, namely intentional and non intentional factors. For intentional factors we identified deviations related to comic usage of Bukavu Swahili whereas non intentional factors, consisted of deviations related to the origin of the speaker and others related to word confusing through imitation. To carry out this investigation we used the interview and documentation as major methods while observation, discussion and comparison helped as major techniques.