What is the viscous fluid that came out of me after watching pornographic movies during the day in Ramadan without feeling a tremor or force when it was expelled, and what is its ruling, and what is its effect on my fasting?

Watching pornographic films is forbidden, and its prohibition becomes more severe in Ramadan, especially for a fasting person, as the Prophet, peace and blessings be upon him, said: "Whoever does not abandon false speech and acting upon it, Allah has no need for him to abandon his food and drink."

You must repent to Allah for what you have done.

If the discharge was madhiy (pre-seminal fluid), it does not invalidate the fast, but it is impure and nullifies ablution (wudu').

However, if it was maniy (seminal fluid), then your fast has been invalidated, and you must make up that day.