A point of vulnerability.
The warrior Achilles was totally protected by his armor, except for a small spot by the back of his foot where an arrow went through.

A weakness for chocolate cake was the dieter's Achilles heel.
by Chloethecat June 28, 2012
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This is a dick that you can never say no to, because you find it so amazing, and therefore it is your biggest weakness regarding sex. An Achilles dick can be a major temptation whether you are single or already in a committed relationship.
I know you keep seeing him because he’s your Achilles dick, but you need to find a man who has heart too.
by Littlefoot96 June 5, 2020
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A tendon in your foot right above your ankle.
Vital nerve for moving your foot and standing
If you sever your achilles tendons, you won't be able to stand
by Dr. McFeces December 19, 2011
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A sore toe, generally an ingrown toenail, which is a huge weakness to the owner. In any fight, if someone steps on your Achilles Toe, you've lost.
I had A stub in the dark last night, so now I can't let anyone know about my Achilles Toe.
by Fred Invisible October 24, 2010
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When you are with a woman / man and you beat your dick without them knowing and then cumming in their coffee while they go to the bathroom.
Person 1 : "Im going to the bathroom"
After he leaves
Person 2 : "Im gonna Dirty Achilles him"
Person 3 "I cant wait to see his reaction"
by AADGHAYGAYHFUIAHF June 21, 2021
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In greek Legend Achilles was a famous and brave warrior who fought at The Battle of Troy, He was ultimately killed by an arrow to the heel. When Achilles was young his goddess mother dipped him in the River Styx which made him almost immortal, he was held the heel and hence that part of his body didn't touch the river. Hence his heel was his weakest part and ultimately caused his downfall. This is an idiom used to describe a hidden weakness or fault in somebody which may be used to harm them.
English Teacher: Hamlet's tragic flaw or Achilles Heel was procrastination.
by lady a la gaga February 6, 2022
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Goblin that hides under bleachers or any other object that leaves a space for your heel and slices the tendon on your heel
The Achilles goblin sliced my Achilles heel and I couldn't find him
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