mouse-yank-primary

mouse-yank-primary is an interactive compiled Lisp function in `mouse.el'.

It is bound to <mouse-2>.

(mouse-yank-primary CLICK)

Insert the primary selection at the position clicked on.
Move point to the end of the inserted text, and set mark at
beginning. If `mouse-yank-at-point' is non-nil, insert at point
regardless of where you click.