Based is a word used when something is agreeable, great, cool, or in extreme cases, even misogonistic or homophobic.
Person 1: Episode 21 of (insert show) is the best episode.
Person 2: Based.
When two people have the exact same damage percentage in a conclave PVP match, but vastly disproportionate kills.
-Same dmg, 26 kills, 12 kills. Based.
-Chase me less next time idk lol cya.
when something is sheesh as fuck
Chad; yo bro im based
Sean: sheesh.
bill: hey did you see what hideki posted
joe: yeah he was based as always