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1.
from a song "evry me and every you" by Placebo, "sucker love" is using people for sex until you get bored with them. It's the complete opposite of relationships and love.
"sucker love I always find, someone to bruise and leave behind"
by F1nch May 21, 2005
 
2.
One who is a sucker for love
I'm such a sucker love that I always end up being hurt.
by Araya April 25, 2005