The glossing works fine when there's a verb in the dictionary to work on. I have a work-around involving a spcial glossing-only file for odd-balls. I've put ジコる in there.

@@ -9,4 +8,0 @@
-</r_ele>
-<r_ele>
-<reb>ジコる</reb>
-<re_nokanji/>

That sounds like an issue with the text-glossing systems to me. These systems will supposedly also miss things like ハシった, アタった, ツブし
た, ツブれた, all which have been in about as many tweets as ジコった the past week. I don't have any issue including katakana forms like this 
when they're reasonably common (a case could certainly be made for adding コケる to 転ける, for example), but when we're looking at a 
supposedly more slang-y form of the word and even the usage on twitter is less than 1% of the more common form, I don't think there's any 
real case for adding it.

It's a bit more than that. One of the roles of our entries is to enable text-glossing systems such as Rikai* and the WWWJDIC function. If I put some text from an example of usage of ジコる into the latter (猛スピードを出してジコった。) it matches on ジコチュー, which is quite wrong.
I realise there are heaps of things which get katakanaized, and we can't put them all in, but I don't have a problem with these 体言+る versions if they have some currency. ジコる is marginal, as I said at the beginning, but I think it just gets over the line.

Twitter:
事故った 8 tweets past 30 minutes
ジコった 3 tweets _the past week_
I get around the same amount of hits for ハシった (i.e. 走った)
I don't think adittions like this should be waved in with "it's harmless". I don't think it's harmless. It's clutter and it's misleading.

KM n-grams (3 years older than Google's)
事故る	1817
じこる	3
ジコる	8
https://osaka-kyoiku.ac.jp/_file/gakusei/kikaku/gakudayori/166/campus_kotoba.pdf <- list of 体言+る words.

It's "out there", but it seems not to be in large quantities. Harmless, though.
We have quite a few listed on that page, e.g.デコる.

@@ -8,0 +9,4 @@
+</r_ele>
+<r_ele>
+<reb>ジコる</reb>
+<re_nokanji/>