Fat
You have a big person here, with an extra drop of something below their thigh, hanging down. That's fat right there. This person has fat hanging off their fat.
Maybe you should touch the fat to see what it is... feel it, and squeeze it. It'll help you to remember that this kanji means "fat."
たい, た
ふと
おお
This fat person also has a fat tie (たい). It's really thick and luxurious. Imagine them tying their lovely fat tie.
Imagine them trying to tie the tie, but they can't lift their hands around to do it. You have to help them out. Another thing that might help you to remember this kanji's reading is that it's the same reading as 大 (or, one of the same readings). Similar kanji often have similar readings, which is a good thing to know when you have to guess (it's true with this one, anyways!).