Apps - long, long ago (the 90s) , when Bill Gates ruled the computing universe, the term PC was used to distinguish personal computers using a Microsoft operating system (95%) from the small fry like Apple who did not.
A similar process has occurred with the word apps. This now generally means mobile computing software - as opposed to software used on other computers. So there is Photoshop (the application) on your iMac and Photoshop (the app) on your iPhone.
Bitcoin - the most popular 'virtual' currency - see here.
BYOD - Bring your own technology - see here
To ping is to send a packet to a computer and wait for its return (Packet Internet Groper). For those outside of IT that doesn't help much.
In practical terms to ping is to notify a website(s) that you have updated your site with new material. This is often done automatically - via Twitter, Facebook and other social media sites.
SEO - search engine optimisation. Website traffic is largely driven by Google - and to a much lesser extent by Bing and smaller niche search engines. SEO is the art of making your web page easier to find by the 'spiders' which crawl the web looking to recognise images and content visitors will be interested in. Each page has a ranking depending on the search term - the aim is to get as close to the top of the page as possible.
Spoof - in general English this means to parody in an affectionate way - the Airplane films being a good example. In current IT usage the word has darker connotations - to spoof a password or user ID is to falsify, usually with the intention to defraud.
SSD - take care with the middle initial on this one. It stands for solid state device which in human English means that it does not have a hard drive with moveable parts. This makes it a lot lighter and - in theory - less prone to crashes and the dreaded 'hard drive down'
Third and fourth generation access to bandwidth - or broadcasting capacity. In practical terms this means
3G - fast internet connection for mobile phones now slowed down by weight of traffic
4G - much faster connection.
Solution: everyone moves to 4G? Only problem is that access to networks is in the end controlled by national governments. In the UK this means that licences are finally becoming available - but at a very high price. So 4G will slowly become available but cost more than 3G.
And when that network slows down - bring on 5G.