What is known by English teachers as an oxymoron, i.e. a word which is qualified by a second word, an adjective, which is completely redundant (adds nothing new to the meaning of the first word). Crap is by definition anal, unless it comes from the mouth-crapping aliens on the planet XAARFQTYSHAJK!LP.
Nevertheless, saying two swear words is always better than saying one for releasing tension, so "anal crap" is perfectly legitimate, whatever those fucking english teachers say.
Evrything english teachers say is a pile of anal crap.
The other definition is complete shit..."anal crap" for that matter. The person who posted it should be ashamed cause they're a f***ing moron. An oxymoron is a combination of contradictory terms (e.g. deafening silence or hopeful pessimists) which still makes sense somehow. Anal crap is just an example of redundancy (since where else would crap come from except your anus?)just like "huge giants". Repeat: other definition is "anal crap"
Who gives a shit? You're not going to use it in a normal conversation...