gofer; errand runner; dogsbody
Colloquial abbreviation of 使いっ走り. Refers to a person who is ordered around to run errands or fetch things, often with a nuance of being exploited.
See also: 使いっ走り
The new guy is always made to run errands.
using continuously; using non-stop
Colloquial abbreviation of 使いっぱなし. Describes leaving something in use without a break, or using something continuously.
See also: 使いっぱなし
He's his boss's gofer and is sent to buy coffee every day.
If you leave the air conditioner running non-stop, the electricity bill gets high.
This computer has been in continuous use for three days now.
using continuously; leaving on; using without a break
Colloquial abbreviation. Sense 1 is from 使いっ走り (errand runner), sense 2 from 使いっぱなし (leaving something in use). The exact derivation of the clipped form is uncertain.