This "-maxxing" suffix, which originated in online communities, signifies a process of optimization—of getting the best possible physical outcome. Spermmaxxing refers to the practice of maximizing various aspects of one's sperm, including "load size, sperm count, swimability, and shape".
This unique combination of elements suggests a few potential sources: janet+mason+mega+sperm+bath+for+mrs+masons+new
Once I have more context, I'll do my best to help you produce a report. This "-maxxing" suffix