The time_point representing the current time. time_point is a member type, defined as an alias of time_point<high_resolution_clock>.
Slammer (also known as Sapphire, Helkern or SQLExp) was a worm that appeared in 2003 January and was the fastest-spreading worm of its time. The worm was an extremely simple piece of code and its payload was an unintended byproduct of its spreading ability.
(Originally, a dunk was the act of putting the ball directly in the hoop. A slam dunk was the powerful version of same.) Thus, by extension, a slam dunk is a metaphor that means a certain success, an unstoppable action.