https://imgur.com/a/2fq1wVL
The word can be used multiple ways, often to emphasize a word (usually insult).
1st pic:
"get cancer"
2nd pic:
"cancerretard HighTwenty"
2x unnecessary use of the word cancer:
"so if you're talking, you're talking to cancer nobody"
"what a cancer aim"
last pic:
"cancer dork"