Wiktionary
vb. 1 (context transitive English) to give a load to 2 (context intransitive English) to get a load 3 (context idiomatic ambitransitive English) to fully load (a weapon)
WordNet
Usage examples of "load up".
Part of me says, load up the B-2 bombers on Guam with the B-61 gravity bombs and send them to Beijing, but I suppose that's a little bit of an overreaction.
She also wanted to keep one pole movable so the horse could bring the load up to the cave.
Point is I've brung a detail to load up the wounded and move them to the camp.
We could load up on spare batteries and make it to Miami and back with at least some of the stuff we need.
So, grab your coffee (or whatever beverage), load up on the chocolate bonbon's, kick back in the chair, and have a good time.
Be ready to load up and launch as soon as we return with the women.
I got back to Bahrein about four days after that, after taking my load up to Yenanyaung.