The non-dumb-name out: You look circumcised

[Spose']

Yeah, I know absolutely nothing about LoL so there's that.

The first time I read it, I honestly felt like the sentence was unfinished. Let me give an example:

Oriのultが馬鹿みたいな火力で草を焼いてる

Ori's ultra is burning up the grass with its ridiculous offensive output. Now, ignore the fact that this might or might not actually be possible in the game, this is just an example.

で can also be used as a connective particle for na-adjectives when listing characteristics, for example その子が乱暴で騒がしいよ, lit. that kid is violent and noisy.

In all honestly since it was just a Tweet anything is possible.

Thanks for trying even if you aren't fully sure of what she meant to say. At least I got the general idea of the sentence though. Even without figuring out it's meaning you still managed to teach me a good bit of information. Particles are something that really mess me up, they can have so many meanings.