When someone keeps talking for no reason

Mercury retrograde is the act of taking a shit whilst mooning one or more human beings. Your day can typically being going well, according to your horoscope, until you are forced into witnessing Mercury retrograde. Performing Mercury retrograde will often speed the astrological cycle forward for the individual performing the Mercury retrograde, bringing about happy and fruitful times to come.

Adding un-necessary lines into a conversation, speech or essay.
Teachers often tell to students not to waffle before submitting an assignment. However, I think about me and my boyfriend playing hardcore on the bed whenever they mention that word.

(some noobs will think about pancakes)

adj. or verb - indecisive; unable to make up one's mind; playing the safe middle ground due to one's own lack of conviction or sense of morality.

Excessive talking, sometimes to the point where it gets boring and drags on for way too long, aka rambling.
It's a slang word used in Britain, but mainly in London or other parts of England by roadmen / younger generations.

unsure about something - debating between choices or ideas

To utilize extraordinary means to gain something of value by defeating a poorly designed system run by a badly managed entity.