The morning after. After long nights of partying that probably entailed many drugs and alcohol.
TMA! Last night was crazy! Hungover asf.
A short term for "tell me anything," that is usually used in text messages. It implies that the sender of a message with this term will listen to anything you tell him/her.
Girl: "hey hows your day"
You: "its ok. stressful"
Girl: "you can tma btw :)"
In this example conversation, it implies that the girl is actually interested in you.