n. 1. [techspeak] Term for a frequent consequence of data arriving faster than it can be consumed, esp. in serial line communications. For example, at 9600 baud there is almost exactly one character per millisecond, so if your silo can hold only two characters and the machine takes longer than 2 msec to get to service the interrupt, at least one character will be lost.
2. Also applied to non-serial-I/O communications.
"I forgot to pay my electric bill due to mail overrun."
"Sorry, I got four phone calls in 3 minutes last night and lost your message to overrun."
When thrashing at tasks, the next person to make a request might be told
3. More loosely, may refer to a buffer overflow not necessarily related to processing time (as in overflow screw).