The phrase "no homo" carries with it the same sort of power as a level 9 wizard spell (like POWER WORD: KILL!). Any and all faggotry in a given statement or act is banished to the depths of faggot-hell. No homo makes it totally not gay.
Dxun: if nigba had a penis i would suck it.
Hanny: Would you suck my penis?
Dxun: no homo