"On uppers" is a slang term that refers to being energized or exhilarated, often due to the use of a stimulant such as amphetamines or cocaine. While this phrase is commonly used, it is also a term that is associated with drug use and can be seen as inappropriate or offensive to some people. To avoid using this term, there are plenty of other words and phrases you can use to describe feeling energized or excited. For example, you could say you are pumped up, fired up, or stoked. Additionally, you could use phrases like full of energy or feeling invigorated. These alternatives are not only more reliable and acceptable, but also more professional.