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1. Feels
A wave of emotions that sometimes cannot be adequately explained.
Watching Back To The Future gives me all sorts of nostalgic feels.
2. Feels
Short for feelings. Typically used when someone is fangirling/fanboying over something, or just saw something sad.
Ugh this show is giving me so many feels.
Right in the feels.
3. Feels
Feelings you get when something you read/see/hear/etc is just so touching and perfect that you can't help but make sounds, curl into a ball, and never stop thinking about said thing that made you this way.
Oh my god, The Fault in Our Stars by John Green gave me so many feels!

Dude, that new episode yesterday gave me all the feels.
4. feels
The intense emotion of a fandom.
OH MY GOD MY FEELS KATNISS AND PEETA JUST KISSED

FINNICK DIED ALL MY FEELS

NOOO SNAPE MY FEEEELLLSS!!!
5. feels
the feelings you get when you watch or look at some sort of picture of video, most times of a celebrity, where you cannot place what your feeling (usually feelings of the sexual variety)
omg after looking at that picture of one direction i have major harry feels
6. Feels
Expression of agreement, sympathy, acknowledgment and a sign that you approve or comprehend a given action, thought, or situation. Essentially, this is the shortened expression of: "I feel that."
Chester: Hey, what did you do today John?
John: I banged two girls, and then went to the gym and benched 300lbs like it wasn't nothing.
Chester: Damn, John, I feels!

or
Josh: Hey man, you're sister is HOT!
Chester: Man, WTF, I don't feels that, feels OFF her, bro.
Josh: But, c'mon man, you don't at least feels me on that subject?
Chester: NO!
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