Think skateboarding on white water. A squirt is a very small kayak, almost a hollowed out surfboard, that skips, spins, jumps, and yes, squirts out of rivers. It is dangerous fun, with a similar underground culture as other x-treme board sports. The funky illustrations tell all.
“Attaining” is the term I coined in the late 1970s for paddling upstream. This is quite a fine form of fun. There are even attaining races, which are great entertainment. If you want to perfect your attaining skills, for whatever reason, remember a few basic tips. Timing and accuracy are much more important here than in downstream negotiations: plan your lines well in advance and let the river dictate the timing; and pace your energy expenditure so you will have the fierce energy necessary for the tough attainments. Learn to feel the force around you, and you will be able to attain up paper-thin eddies that are hundreds of feet long.