I don't know how to change notes, so I'm just gonna write it here. The word on boobs is "тискай" (for you to use google translate or something), it's pretty simple and means "squeeze" or "grope" considering where it is. There's no way it means "squish", it just doesn't make any sense. Even if it's some weird slang I'm not aware of, my options are still better. I'd recommend the first one, it's more playful.