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1.
Any unwanted or unexpected pieces of clothing, lint, or hair that become stuck on the fingers/tongue of one who is in the act of sexually stimulating a woman either manually or orally.
Rico had to stop while performing cunnilingus on Marjorie to pick some of the bycatch off of his tongue.
by Bebe Jooga June 25, 2010
 
2.
Too inadvertently woo the friend(s) of the girl/guy one is actually pursuing.
Bro: I've been trying to get on Hannah but I think her friend Emily likes me now.

Bra: Dude, she's not a bad by-catch.
by ajax1221 September 14, 2010