A sticky substance used to attach things together.
Stickums are usually helpful for making things stay together.
Examples:
I use stickums to put my drawings on the wall.
The stickums keep the paper from falling off.
She puts stickums on the back of the photo.
The stickums are so sticky, they stick to my fingers!
I put stickums on everything, and now everything is stuck together!
The stickums are like magic glue that never dries.