To fall behind; someone who is mentally slow trails a lot... someone who says something dumb or irrelevant is trailing. Trailing can also be used anywhere where you would use the words crazy, tripping, or trippin'. Trail can be used anywhere where you would use the word trife.
Trailing can also be written or said as trailin'.
Adam: I like cows.
Tim: Dude, you must be TRAILIN' (trailing)!
Lisa: That new pair of shoes is totally trail!
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