In normal circumstances, keystrokes is describing the act of typing something using a keyboard.
However, on the internet, specifically Gelbooru and other hentai picture sites, it's caught on as a meme*. It's used by members who are presumably masturbating to said pictures, and since comments can't be posted with fewer than three to four characters, they just either post "keystrokes" in all caps or many times.
It's used similarly to "fap" in this regard, which is the onomatopoeia for masturbation.
*A meme is a fad almost always exclusive to the internet that very quickly grows insanely popular.
The most absolutely sweetest person you'd ever meet.
She's gotta smile like no other, and eyes as bright as the stars, times three. When she loves, she loves hard. She puts her all into making everyone around her happy... That she sometimes forgets about her own happiness too. Has personal struggles, self worth, and identity struggles here and there. But eventually you pull out! You make it through! You prove them ALL WRONG in the end. You are worth it. You will make you. You were meant to stand out... So stop trying to stand in.
"Keyarah, Strive to be the person you want to fall in love with"
A very sweet girl who is lovable and sweet, she can be very hyper butttt she can get into some trouble at sometimes but then knows her way around to not be introuble.
Shes beautiful girl with big dreams. She is creative, hard-working, independent, and very intelligent. She is known for putting a smile on people's faces and she is very sweet. She is someone that you can trust and any guy would be lucky to have her. She loves to please others and she is a giver. She's the one that all the girls want to be and all the guys want to be with.
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.
A lighthearted reaction upon receiving disappointing news of some sort. Usually something that isn't a particularly a big deal, esp. when it primarily affects someone else - sort of a mild schadenfreude. Sometimes doubled or tripled, and possibly said in a sing-songy voice for added comedic effect to imitate a muted trumpet, which is how the meme originated.