In Argentina and Mexico, dating someone new immediately after ending a previous relationship — using a new person to bounce back emotionally. The rebound relationship, known and named the world over.

To completely ignore something or someone — to walk right past without stopping, paying attention, or engaging. The deliberate act of treating something as if it simply doesn't exist.

Without order, reason, or coherence — done haphazardly without any logical structure or purpose. Something done sin ton ni son is completely random and inexplicable.

For nothing, in vain, a wasted effort with zero result. In Argentina and Uruguay al cuete is the deflated admission that all that work or energy led absolutely nowhere.