you know how some guys will just sit there near the edge of the stage, right outside of your nair range, and charge an fsmash, hoping you'll jump into it?
you can press back to let go of the edge, flip a bacon at them, and upb back to the lip - free hit.
also, when an opponent is reeling offstage from being hit by a fair or whatever, i'll jump out after them real quick and try to upb sweetspot them while they're still high in the air. easy kill sometimes, especially if you mix it up with fair and chef.
if they're clearly not so good at teching the roll, ill grab, hit a repeatedly til i hear them start to mash buttons, THEN dthrow. throws some ppl's timing off.
making loud noises and jumping around irl also seems to help.
throwing your controller down and mimicking g&w's 2d breakdance victory taunt after each win is extremely effective at demoralizing your opponents