31c6db52_GIMP_Selection_Tools__Description
[Tool] Lasso Selection Tool [Description] 
Allows you to draw a selection free-hand with your mouse or other pointer. When you release the mouse button, the selection is closed by connecting the current pointer location to the start location with a straight line. You can go outside the edge of the image display and come back in if you want to.
GIMP Selection Tools
Description