Although originally defined as "something atrocious" in a context such as "cutting up that dead baby and placing its parts in fridges all over the US is a heinous crime", heinous has evolved into a slang word used to imply feelings of discontent, anger, meloncholy, satisfaction, happiness, approval, or other random feelings.
after school: "OMG, that math test was so heinous"
insult: "ur mom is heinous"
random comment: "heinous bananas"
approval: "O man, those spandex pants are so heinous!"
random comment : heinous repeatedly because we know what it sounds like
I feel bad: heinous
I feel good: heinous
Life sucks: heinous
Life is good: heinous
adj. used to describe something excessively cool, proverbially approaching the point of a carnage of awesomeness.
Dude, you remember the time that girl told you that she wanted to have sex with you on her private beach? And then she told you she was bisexual and asked you if you wouldn't mind it if she invited her girlfriends along? Yeah, that shit was HEINOUS!
Going to s Star Trek convention and having fun, would be heinous.
Getting drunk and screwing an ugly David Schwimmer aka Skanky Ass Hoe, would be heinous. Getting caught killing someone would be heinous. Catchin yer dad jackin off to you jackin off in yer mom's nightie would be HEEEEEEEINOUS