This study investigated negative uses of ICT and its Implications among secondary school students in Oyo State, Nigeria: A Phenomenographical analysis towards a Grounded Theory. A multi stage sampling technique was deployed and used in this study which involves the convenient sampling at the first stage, random sampling at the second stage, purposive sampling technique at the third stage and the purposive sampling technique was also used at the fourth stage to select respondents of the study. Information obtained were recorded and transcribed and used for analysis, and a thematic analysis was done. Findings of the study revealed that in a hierarchical order, the negative uses of ICT among students can affect and reduce: their concentration on academic work; students learning, cognitive and assimilation; students academic performance and achievement; the nation’s education system in achieving its goals and objectives; and poses challenge to national development through high rate of poverty and unemployment. It recommends that the stakeholders of the Nigeria education system such as teachers, parents, governments and policy makers should monitor and provide policies that would help the mitigation of the negative uses of ICT among students in Nigeria to be able to tap into the benefits that ICT brings. Also, it is expedient to train teachers on how they can control and manage students in classroom in this ICT generation to ensure effective performance.