Abbreviated way of saying you've already seen something. Short for "2 cool", originally "too cool for you", meaning you're too cool to be shown anything new.
An abbreviation of the phrase 'Second Choice' which can be used to describe a number of things, but mainly aimed an a boy/man who has been turned to after the first choice has been lost.
Second-cousin: grandparent's full sibling's grandchild. Has among themselves; different two parents, different four grandparents, two great-grandparents in common and different six great-grandparents.