USB Nerf Dart Launcher, great for launching death upon your co workers.

LED Flashlight.

Father's Day means ties right? Why not select a nerdy tie for your geeky dad.

USB powered Plasma Ball

Your Dad can always use more memory sticks, trust me.

Bow tie and matching suspenders.

Circuit Board Ties.

Business Card Scanner App. There are numerous apps in the Google Play store for your Dad.

USB Boxer Toy... Waste more time while on the job.

Does your dad love Linux?

Comic Books. Dad needs new bathroom material other than Playboy.

Coffee Gift Cards. Is your dad pulling an all nighter working on the new server migration? If so, he needs coffee.

USB Hard Drive... Dad needs storage to download all the Mature section data before Monday.

More Ties...

Geeky Tee shirts, then again, most Geek Dad have plenty of these.

This LED flashlight has a hook and a magnet to hang and attach this light in the best spot for you to see.

For those rich kids, get your geek dad a sports car... I know I want my son to get me something like this one day :P

See Bow ties get the hot ladies... or maybe its the fat wallet from his high paying geek job.

USB Battery charger for your dad's phone and or tablet. A must have. I have two myself.

Coffee Gift Cards... Did I mention Coffee?

USB or Bluetooth speakers for your smart phone. Does your dad love music or movies on this phone? This is perfect.