The paper reviewed code mixing and code switching as a factor of code choice and mark of Nigerianism among undergraduate students of Babcock University. Descriptive analytical method was adopted and population for the paper comprised the undergraduate students of Babcock University Ogun state Nigeria where 240 students were selected from five Departments in the school (faculty) of Education and Humanities using purposive sampling technique. The collated data was analysed using Basil Bernstein theory of language codes. A designed questionnaire titled code mixing and code switching usage among students in the School of education and humanities was administered among the 400 level students in each selected department and responses were collated and analysed. Findings showed that code mixing usages occurred more with male students at 57% while 43% usages occurred among the females. Secondly, code switching occurred more among females. At the ratio of 59% and 41% among the males. The paper therefore concludes that the occurrence and usages of code mixing and code switching go beyond inter personal face to face interaction to social media platforms and this underscores the effect of Nigerianism in their flare and flavour of language use.